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