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x in (-oo:+oo)
8/17 = x/7 // - x/7
8/17-(x/7) = 0
8/17-1/7*x = 0 // - 8/17
-1/7*x = -8/17 // : -1/7
x = -8/17/(-1/7)
x = 56/17
x = 56/17
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