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x in (-oo:+oo)
(1/2)*x = 4*y // - 4*y
(1/2)*x-(4*y) = 0
(1/2)*x-4*y = 0
1/2*x-4*y = 0 // + -4*y
1/2*x = -(-4*y) // : 1/2
x = (-(-4*y))/1/2
x = 8*y
x = 8*y
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