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x in (-oo:+oo)
6/14 = x/35 // - x/35
6/14-(x/35) = 0
3/7-1/35*x = 0 // - 3/7
-1/35*x = -3/7 // : -1/35
x = -3/7/(-1/35)
x = 15
x = 15
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