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