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t in (-oo:+oo)
5/8 = t+7/8 // - t+7/8
5/8-t-(7/8) = 0
5/8-t-7/8 = 0
-t-1/4 = 0 // + 1/4
-t = 1/4 // * -1
t = -1/4
t = -1/4
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