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