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x in (-oo:+oo)
y = (-8/3)*x+9 // - (-8/3)*x+9
y-((-8/3)*x)-9 = 0
(8/3)*x+y-9 = 0
8/3*x+y-9 = 0 // - y-9
8/3*x = -(y-9) // : 8/3
x = (-(y-9))/8/3
x = 3/8*(9-y)
x = 3/8*(9-y)
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