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