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x in (-oo:+oo)
(1/2)*y = 2*x+11/2 // - 2*x+11/2
(1/2)*y-(2*x)-(11/2) = 0
(1/2)*y-2*x-11/2 = 0
1/2*y-2*x-11/2 = 0 // - 1/2*y-11/2
-2*x = -(1/2*y-11/2) // : -2
x = (-(1/2*y-11/2))/(-2)
x = (11/2-(1/2*y))/(-2)
x = (11/2-(1/2*y))/(-2)
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