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