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x in (-oo:+oo)
Y-8 = (2/3)*x // - (2/3)*x
Y-((2/3)*x)-8 = 0
Y+(-2/3)*x-8 = 0
Y-2/3*x-8 = 0 // - Y-8
-2/3*x = -(Y-8) // : -2/3
x = (-(Y-8))/(-2/3)
x = -3/2*(8-Y)
x = -3/2*(8-Y)
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