解:解方程,此方程的解为x = 40
x - 0.15x = 34
(1 - 0.15)x = 34
(100/100 - 15/100)x = 34
(85/100)x = 34
(17/20)x = 34
x = 34 ÷ 17/20
x = 34 × 20/17
x = 40
答:此方程的解为x = 40
x-0.15x=34,
0.85x=34,
x=34÷0.85,
x=40
0.85x=34
x=40