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t in (-oo:+oo)
4*t-(9*((t^1)/2))+7 = 0
4*t+(-9/2)*t+7 = 0
7-1/2*t = 0 // - 7
-1/2*t = -7 // : -1/2
t = -7/(-1/2)
t = 14
t = 14
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