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t in (-oo:+oo)
4/12 = t/42 // - t/42
4/12-(t/42) = 0
1/3-1/42*t = 0 // - 1/3
-1/42*t = -1/3 // : -1/42
t = -1/3/(-1/42)
t = 14
t = 14
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