x-1/5=8 (x+0.9)=5(x-1.

问题描述:

x-1/5=8 (x+0.9)=5(x-1.
x-1/5=8 (x+0.9)=5(x-1.

x-1/5=8
x=8+1/5
x=8.2
(x+0.9)=5(x-1.7)
x+0.9=5x-8.5
x-5x=-8.5-0.9
-4x=-9.4
x=23.5