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t in (-oo:+oo)
4/12 = t/54 // - t/54
4/12-(t/54) = 0
1/3-1/54*t = 0 // - 1/3
-1/54*t = -1/3 // : -1/54
t = -1/3/(-1/54)
t = 18
t = 18
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