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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*(y+7)
x = -8/7*(y+7)
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