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t in (-oo:+oo)
(1/6)*(9*t-7) = t+7/12 // - t+7/12
(1/6)*(9*t-7)-t-(7/12) = 0
(1/6)*(9*t-7)-t-7/12 = 0
1/6*(9*t-7)-t-7/12 = 0
(1/6*12*(9*t-7))/12+(12*(-t))/12-7/12 = 0
1/6*12*(9*t-7)+12*(-t)-7 = 0
6*t-14-7 = 0
6*t-21 = 0
(6*t-21)/12 = 0
(6*t-21)/12 = 0 // * 12
6*t-21 = 0
6*t-21 = 0 // + 21
6*t = 21 // : 6
t = 21/6
t = 7/2
t = 7/2
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