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x in (-oo:+oo)
(12*x)/4 = (-2*y)/2 // - (-2*y)/2
(12*x)/4-((-2*y)/2) = 0
(12*x)/4+y = 0
3*x+y = 0 // - y
3*x = -y // : 3
x = -y/3
x = -y/3
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