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t in (-oo:+oo)
6*t+8 = 7*t+12 // - 7*t+12
6*t-(7*t)-12+8 = 0
6*t-7*t-12+8 = 0
-t-4 = 0 // + 4
-t = 4 // * -1
t = -4
t = -4
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