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x in (-oo:+oo)
17/8 = x/7 // - x/7
17/8-(x/7) = 0
17/8-1/7*x = 0 // - 17/8
-1/7*x = -17/8 // : -1/7
x = -17/8/(-1/7)
x = 119/8
x = 119/8
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