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x in (-oo:+oo)
y = (-1/2)*x+9 // - (-1/2)*x+9
y-((-1/2)*x)-9 = 0
(1/2)*x+y-9 = 0
1/2*x+y-9 = 0 // - y-9
1/2*x = -(y-9) // : 1/2
x = (-(y-9))/1/2
x = 2*(9-y)
x = 2*(9-y)
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