(8x+5):(5x-5)=9:4

问题描述:

(8x+5):(5x-5)=9:4

9(5x-9)=(8x+5)x4
45x-81=32x+20
13x=101
x=7

(8x+5):(5x-5)=9:4
9(5x-5)=4(8x+5)
45x-45=32x+20
45x-32x=20+45
13x=65
x=5