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x in (-oo:+oo)
Y = 3-((1/2)*(x-2)) // - 3-((1/2)*(x-2))
(1/2)*(x-2)+Y-3 = 0
1/2*(x-2)+Y-3 = 0
1/2*(x-2)+Y-3 = 0
Y+1/2*x-3-1 = 0
Y+1/2*x-4 = 0
Y+1/2*x-4 = 0
Y+1/2*x-4 = 0 // - Y-4
1/2*x = -(Y-4) // : 1/2
x = (-(Y-4))/1/2
x = 2*(4-Y)
x = 2*(4-Y)
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