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x in (-oo:+oo)
-x/8 = -(-8/7) // + -8/7
-x/8-8/7 = 0
-1/8*x-8/7 = 0 // + 8/7
-1/8*x = 8/7 // : -1/8
x = 8/7/(-1/8)
x = -64/7
x = -64/7
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