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x in (-oo:+oo)
Y = (-9/10)*x+9 // - (-9/10)*x+9
Y-((-9/10)*x)-9 = 0
Y+(9/10)*x-9 = 0
Y+9/10*x-9 = 0 // - Y-9
9/10*x = -(Y-9) // : 9/10
x = (-(Y-9))/9/10
x = 10/9*(9-Y)
x = 10/9*(9-Y)
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