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3(x+y)=4(x-y)=8
2x+2y-3x+3y=-6
3x+3y+4x-4y=8
-x+5y=-6
7x-y=8 /*5
-x+5y=-6
35x-5y=40
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34x=34
x=1
y=7*1-8
y=-1