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t in (-oo:+oo)
5-(2*t) = t/2 // - t/2
5-(2*t)-(t/2) = 0
5-2*t-(t/2) = 0
5-5/2*t = 0 // - 5
-5/2*t = -5 // : -5/2
t = -5/(-5/2)
t = 2
t = 2
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