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t in (-oo:+oo)
3/4 = t/7 // - t/7
3/4-(t/7) = 0
3/4-1/7*t = 0 // - 3/4
-1/7*t = -3/4 // : -1/7
t = -3/4/(-1/7)
t = 21/4
t = 21/4
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