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