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2x-y/3-3x/4=3/2 /*12
x+5y+3y=-30
8x-4y-9x=18
5x+8y=-30
-x-4y=18 /*2
5x+8y=-30
-2x-8y=36
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3x=6 /:3
x=2
5*x+8*y=-30
5*2+8*y=-30
10+8*y=-30
8*y=-40 /:8
y=-5