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