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t in (-oo:+oo)
5/4 = t/28 // - t/28
5/4-(t/28) = 0
5/4-1/28*t = 0 // - 5/4
-1/28*t = -5/4 // : -1/28
t = -5/4/(-1/28)
t = 35
t = 35
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