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x in (-oo:+oo)
Y-3 = (1/2)*(x-1) // - (1/2)*(x-1)
Y-((1/2)*(x-1))-3 = 0
(-1/2)*(x-1)+Y-3 = 0
Y-1/2*(x-1)-3 = 0
Y-1/2*(x-1)-3 = 0
Y-1/2*x-3+1/2 = 0
Y-1/2*x-5/2 = 0
Y-1/2*x-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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