5x-18=3-2x快

问题描述:

5x-18=3-2x

5x-18=3-2x;
7x=21;
x=3;

x=3

解方程吗?
5x-18=3-2x
5x-18+2x=3-2x+2x
7x-18=3
7x-18+18=3+18
7x=21
7x÷7=21÷7
x=3