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x in (-oo:+oo)
6/14 = x/84 // - x/84
6/14-(x/84) = 0
3/7-1/84*x = 0 // - 3/7
-1/84*x = -3/7 // : -1/84
x = -3/7/(-1/84)
x = 36
x = 36
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