(8 -x)×60+40 x=420怎么解?

如题所述

解:解方程,此方程的解为x = 3
(8 -x) × 60 + 40x = 420

8 × 60 - x × 60 + 40x = 420
480 - 60x + 40x = 420
480 - 20x = 420
20x = 480 - 420
20x = 60
x = 60 ÷ 20
x = 60 × 1/20
x = 60/20
∴x = 3
答:此方程的解为x = 3
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