5/2x+20=(x-35)×7/9怎么解?注:2/5和7/9是5分之2和9分之7

问题描述:

5/2x+20=(x-35)×7/9怎么解?注:2/5和7/9是5分之2和9分之7

5/2x+20=(x-35)×7/9,两边都乘以18,得
45x +360 = (18x - 630 )×7/9,去括号,移项,得
45x -14x = -360 - 490
31x = -850
x = -850/31