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x in (-oo:+oo)
3/14 = x/7 // - x/7
3/14-(x/7) = 0
3/14-1/7*x = 0 // - 3/14
-1/7*x = -3/14 // : -1/7
x = -3/14/(-1/7)
x = 3/2
x = 3/2
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