5 x - 3(20 - x)= 60
解: 5 x - 60 + 3 x = 60
8 x = 60 + 60
8 x = 120
x = 120 ÷ 8
x = 15
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5X-3(20-X)=60
5X-60+3X=60
5X+3X=60+60
8X=120
X=120/8
X=15
5x-3(20-x)=60
5x-60+3x=60
8x=60+60
x=15
x=15