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t in (-oo:+oo)
333 = (1/2)*t // - (1/2)*t
333-((1/2)*t) = 0
(-1/2)*t+333 = 0
333-1/2*t = 0 // - 333
-1/2*t = -333 // : -1/2
t = -333/(-1/2)
t = 666
t = 666
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