(7x-30):3x +30 = 2:3

问题描述:

(7x-30):3x +30 = 2:3
解方程

(7 x - 30):(3 x + 30 ) = 2:3
2(3 x + 30) = 3(7 x - 30)
6 x + 60 = 21 x - 90
15 x = 150
x = 10