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y=1/3x-4/3 /*3
3x-y=-4
3y=x-4
-y=-4-3x /:(-1)
3y=x-4
y=4+3x
3y=x-4
y=4+3x
3(4+3x)=x-4
y=4+3x
12+9x=x-4
y=4+3x
9x-x=-4-12
y=4+3x
8x=-16 /:8
y=4+3x
x=-2
y=4+3*(-2)
x=-2
y=4-6
x=-2
y=-2
x=-2