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t in (-oo:+oo)
(1/6)*(6*t-7) = t+7/12 // - t+7/12
(1/6)*(6*t-7)-t-(7/12) = 0
(1/6)*(6*t-7)-t-7/12 = 0
1/6*(6*t-7)-t-7/12 = 0
(1/6*12*(6*t-7))/12+(12*(-t))/12-7/12 = 0
1/6*12*(6*t-7)+12*(-t)-7 = 0
-14-7 = 0
-21 = 0
-21/12 = 0
-21/12 = 0 // * 12
-21 = 0
t belongs to the empty set
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