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t in (-oo:+oo)
2*t+7*t+5 = 29/4 // - 29/4
2*t+7*t-(29/4)+5 = 0
2*t+7*t-29/4+5 = 0
9*t-9/4 = 0 // + 9/4
9*t = 9/4 // : 9
t = 9/4/9
t = 1/4
t = 1/4
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