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