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t in (-oo:+oo)
4/12 = t/30 // - t/30
4/12-(t/30) = 0
1/3-1/30*t = 0 // - 1/3
-1/30*t = -1/3 // : -1/30
t = -1/3/(-1/30)
t = 10
t = 10
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