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t in (-oo:+oo)
2.6 = t/2 // - t/2
2.6-(t/2) = 0
2.6-1/2*t = 0 // - 2.6
-1/2*t = -2.6 // : -1/2
t = -2.6/(-1/2)
t = 5.2
t = 5.2
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