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