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t in (-oo:+oo)
(1/3)*(t+7) = 49 // - 49
(1/3)*(t+7)-49 = 0
1/3*(t+7)-49 = 0
1/3*(t+7)-49 = 0
1/3*t-140/3 = 0
1/3*t-140/3 = 0
1/3*t-140/3 = 0 // + 140/3
1/3*t = 140/3 // : 1/3
t = 140/3/1/3
t = 140
t = 140
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