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x in (-oo:+oo)
Y-8 = (3/4)*x // - (3/4)*x
Y-((3/4)*x)-8 = 0
Y+(-3/4)*x-8 = 0
Y-3/4*x-8 = 0 // - Y-8
-3/4*x = -(Y-8) // : -3/4
x = (-(Y-8))/(-3/4)
x = -4/3*(8-Y)
x = -4/3*(8-Y)
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