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