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t in (-oo:+oo)
6/7-t = 51/35 // - 51/35
6/7-t-(51/35) = 0
6/7-t-51/35 = 0
-t-3/5 = 0 // + 3/5
-t = 3/5 // * -1
t = -3/5
t = -3/5
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