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x in (-oo:+oo)
15/14-(7*x) = 9 // - 9
15/14-(7*x)-9 = 0
15/14-7*x-9 = 0
-7*x-111/14 = 0 // + 111/14
-7*x = 111/14 // : -7
x = 111/14/(-7)
x = -111/98
x = -111/98
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