No need to bring units.
For example, let's say my sister is x years old and my brother is y years old.
(y-x) y =18 2y-x =18
X -(y-x) = 12 2x-y = 12
X y = 30
3y = 48
Y = 16
X = 14
My sister is 14 years old
By solving the equation, you can avoid the difficulty of backward thinking, and directly list the equation containing the quantity to be solved. The equation has many forms, such as one-element equation, two-element equation, one-element quadratic equation, etc., and can also be composed of equations to solve multiple unknowns.
In mathematics, an equation is a statement containing an equation of one or more variables. Solving an equation involves determining which values of the variable make the equation true. Variables are also called unknowns, and the value of an unknown that satisfies equality is called a solution to the equation.
Extended data
An equation must be an equation, but an equation need not be an equation.
Example: a b=13 conforms to the equation, there are unknowns. This is an equation. This is an equation.
1, 1=2, 100 x 100=10000, these two equations fit the equation, there are no unknowns.
In the definition, the equation must be an equation, but there can be other equations, such as 1, 1= 2,100 ×100=10000, which are all equations, and obviously the range of equations is larger.
Principle of homosolution of equation:
1. The equation obtained by adding or subtracting the same number or the same equation on both sides of the equation is the same solution as the original equation.
2. The equation obtained by multiplying or dividing both sides of the equation by the same non-zero number is the same solution as the original equation.
hello
This depends on whether x has units
If x has units
Once you've solved the equation, x doesn't need units
If x has no units
When you solve the equation, you write the units, and you don't put parentheses on the units
Hello: This depends on whether x has units. If x has units to solve the equation, we don't need units. If x doesn't have units to solve the equation, we need to write units. We don't need parentheses