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t in (-oo:+oo)
6*t+6 = 7*t-1 // - 7*t-1
6*t-(7*t)+1+6 = 0
6*t-7*t+1+6 = 0
7-t = 0 // - 7
-t = -7 // * -1
t = 7
t = 7
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