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t in (-oo:+oo)
10/8 = t/12 // - t/12
10/8-(t/12) = 0
5/4-1/12*t = 0 // - 5/4
-1/12*t = -5/4 // : -1/12
t = -5/4/(-1/12)
t = 15
t = 15
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