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