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t in (-oo:+oo)
7*t+1/2 = t+t+6/4-(4/4) // - t+t+6/4-(4/4)
7*t-t-t+1/2-(6/4)+4/4 = 0
7*t-t-t+1/2-3/2+4/4 = 0
5*t = 0 // : 5
t = 0
t = 0
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