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x in (-oo:+oo)
y = x/2+3/2 // - x/2+3/2
y-(x/2)-(3/2) = 0
y-(x/2)-3/2 = 0
y-1/2*x-3/2 = 0 // - y-3/2
-1/2*x = -(y-3/2) // : -1/2
x = (-(y-3/2))/(-1/2)
x = -2*(3/2-y)
x = -2*(3/2-y)
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