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