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x in (-oo:+oo)
y = (-3/4)*x+9 // - (-3/4)*x+9
y-((-3/4)*x)-9 = 0
(3/4)*x+y-9 = 0
3/4*x+y-9 = 0 // - y-9
3/4*x = -(y-9) // : 3/4
x = (-(y-9))/3/4
x = 4/3*(9-y)
x = 4/3*(9-y)
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