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t in (-oo:+oo)
39/4 = t/12 // - t/12
39/4-(t/12) = 0
39/4-1/12*t = 0 // - 39/4
-1/12*t = -39/4 // : -1/12
t = -39/4/(-1/12)
t = 117
t = 117
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