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x in (-oo:+oo)
7-((7/8)*x) = 8 // - 8
7-((7/8)*x)-8 = 0
(-7/8)*x-8+7 = 0
-7/8*x-1 = 0 // + 1
-7/8*x = 1 // : -7/8
x = 1/(-7/8)
x = -8/7
x = -8/7
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