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t in (-oo:+oo)
(1/2)*t+7*t+7 = 82 // - 82
(1/2)*t+7*t-82+7 = 0
15/2*t-75 = 0 // + 75
15/2*t = 75 // : 15/2
t = 75/15/2
t = 10
t = 10
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