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