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2x+y=0
3x-2y=1
y=-2x
3x-2*-2x=1
y=-2x
3x+4x=1
y=-2x
7x=1
y=-2x
x=1/7
y=-2*1/7
x=1/7
y=-2/7
7x=1
x=1/7
y=-2*1/7
y=-2/7