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t in (-oo:+oo)
3/7 = t/28 // - t/28
3/7-(t/28) = 0
3/7-1/28*t = 0 // - 3/7
-1/28*t = -3/7 // : -1/28
t = -3/7/(-1/28)
t = 12
t = 12
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