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