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x in (-oo:+oo)
y = (-9/4)*x+0+9 // - (-9/4)*x+0+9
y-((-9/4)*x)-9+0 = 0
(9/4)*x+y-9 = 0
9/4*x+y-9 = 0 // - y-9
9/4*x = -(y-9) // : 9/4
x = (-(y-9))/9/4
x = 4/9*(9-y)
x = 4/9*(9-y)
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