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x in (-oo:+oo)
6/14 = x/28 // - x/28
6/14-(x/28) = 0
3/7-1/28*x = 0 // - 3/7
-1/28*x = -3/7 // : -1/28
x = -3/7/(-1/28)
x = 12
x = 12
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