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x in (-oo:+oo)
8 = (7/8)*x // - (7/8)*x
8-((7/8)*x) = 0
(-7/8)*x+8 = 0
8-7/8*x = 0 // - 8
-7/8*x = -8 // : -7/8
x = -8/(-7/8)
x = 64/7
x = 64/7
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