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t in (-oo:+oo)
30 = (2/3)*t // - (2/3)*t
30-((2/3)*t) = 0
(-2/3)*t+30 = 0
30-2/3*t = 0 // - 30
-2/3*t = -30 // : -2/3
t = -30/(-2/3)
t = 45
t = 45
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