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