Meaning: An equation with an unknown number is called an equation. Note: the equation must be an equation, but the equation is not necessarily an equation.

The solution of the equation is an unknown number that makes the left and right sides of the equation equal, and it is a numerical value; Solving the equation is the process of finding the solution of the equation, which is a new calculation process. Listed as follows:

( 1)4x-8 = 34 4x = 34+8 4x = 42 x = 42/4x = 10.5

(2) 12+x = 30 x = 30- 12 x = 18

(3) 10x = 7 1x = 7 1/ 10x = 7. 1

(4)x/9 = 18 x = 18 * 9 x = 162