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t in (-oo:+oo)
10/6 = t/21 // - t/21
10/6-(t/21) = 0
5/3-1/21*t = 0 // - 5/3
-1/21*t = -5/3 // : -1/21
t = -5/3/(-1/21)
t = 35
t = 35
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