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t in (-oo:+oo)
t/12 = 4/8 // - 4/8
t/12-(4/8) = 0
t/12-1/2 = 0
1/12*t-1/2 = 0 // + 1/2
1/12*t = 1/2 // : 1/12
t = 1/2/1/12
t = 6
t = 6
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