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x in (-oo:+oo)
Y-8 = (-1/5)*x // - (-1/5)*x
Y-((-1/5)*x)-8 = 0
Y+(1/5)*x-8 = 0
Y+1/5*x-8 = 0 // - Y-8
1/5*x = -(Y-8) // : 1/5
x = (-(Y-8))/1/5
x = 5*(8-Y)
x = 5*(8-Y)
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