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t in (-oo:+oo)
6*t+3 = 159-7*t // - 159-7*t
6*t-(-7*t)-159+3 = 0
6*t+7*t-159+3 = 0
13*t-156 = 0 // + 156
13*t = 156 // : 13
t = 156/13
t = 12
t = 12
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