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