2016-04-07 12:04发布
(7-x)/4-(x-1)/3=x+1
3(7-x)-4(x-1)=12(x+1)
21-3x-4x+4=12x+12
12x+3x+4x=21+4-12
19x=13
x=13/19
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(7-x)/4-(x-1)/3=x+1
3(7-x)-4(x-1)=12(x+1)
21-3x-4x+4=12x+12
12x+3x+4x=21+4-12
19x=13
x=13/19
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