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x in (-oo:+oo)
Y = (1/4)*(8-x) // - (1/4)*(8-x)
Y-((1/4)*(8-x)) = 0
(-1/4)*(8-x)+Y = 0
Y-1/4*(8-x) = 0
Y-1/4*(8-x) = 0
Y+1/4*x-2 = 0
Y+1/4*x-2 = 0
Y+1/4*x-2 = 0 // - Y-2
1/4*x = -(Y-2) // : 1/4
x = (-(Y-2))/1/4
x = 4*(2-Y)
x = 4*(2-Y)
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