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