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