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x in (-oo:+oo)
y = (-7/8)*x+7/9 // - (-7/8)*x+7/9
y-((-7/8)*x)-(7/9) = 0
(7/8)*x+y-7/9 = 0
7/8*x+y-7/9 = 0 // - y-7/9
7/8*x = -(y-7/9) // : 7/8
x = (-(y-7/9))/7/8
x = 8/7*(7/9-y)
x = 8/7*(7/9-y)
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