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t in (-oo:+oo)
3*t+7 = (6*t)/2-(t/2) // - (6*t)/2-(t/2)
3*t-((6*t)/2)+t/2+7 = 0
3*t-3*t+t/2+7 = 0
1/2*t+7 = 0 // - 7
1/2*t = -7 // : 1/2
t = -7/1/2
t = -14
t = -14
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