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x in (-oo:+oo)
x-(y/2) = 4*x // - 4*x
x-(4*x)-(y/2) = 0
x-4*x-(y/2) = 0
-3*x-1/2*y = 0 // + -1/2*y
-3*x = -(-1/2*y) // : -3
x = (-(-1/2*y))/(-3)
x = -1/6*y
x = -1/6*y
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