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t in (-oo:+oo)
5*t+4 = 6*t+7 // - 6*t+7
5*t-(6*t)-7+4 = 0
5*t-6*t-7+4 = 0
-t-3 = 0 // + 3
-t = 3 // * -1
t = -3
t = -3
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