解方程组2(x-y)/3-x+y/4=-1 6(x-y)-4(2x-y)=16

2(x-y)/3-x+y/4=-1 两边乘12
8（x-y）-3(x+y)=-12
8x-8y-3x-3y=-12
5x-11y=-12
6(x-y)-4(2x-y)=16
6x-6y-8x+4y=16
-2x-2y=16
x+y=-8
y=-x-8
5x-11(-x-8)=-12
5x+11x+88=-12
16x=-100
x=-25/4
y=-x-8=25/4-8=-7/4
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