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x in (-oo:+oo)
10/14 = x/18 // - x/18
10/14-(x/18) = 0
5/7-1/18*x = 0 // - 5/7
-1/18*x = -5/7 // : -1/18
x = -5/7/(-1/18)
x = 90/7
x = 90/7
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