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