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x in (-oo:+oo)
y-9 = (-6/7)*x // - (-6/7)*x
y-((-6/7)*x)-9 = 0
(6/7)*x+y-9 = 0
6/7*x+y-9 = 0 // - y-9
6/7*x = -(y-9) // : 6/7
x = (-(y-9))/6/7
x = 7/6*(9-y)
x = 7/6*(9-y)
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