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x in (-oo:+oo)
y = (1/2)*x+5/2 // - (1/2)*x+5/2
y-((1/2)*x)-(5/2) = 0
(-1/2)*x+y-5/2 = 0
y-1/2*x-5/2 = 0 // - y-5/2
-1/2*x = -(y-5/2) // : -1/2
x = (-(y-5/2))/(-1/2)
x = -2*(5/2-y)
x = -2*(5/2-y)
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