8.7-3.5x=7.8 x等于多少

问题描述:

8.7-3.5x=7.8 x等于多少

8.7 - 3.5x = 7.8
3.5x = 8.7 - 7.8
3.5x = 0.9
x = 0.9÷3.5
x = 9/35