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t in (-oo:+oo)
12 = (2/5)*t // - (2/5)*t
12-((2/5)*t) = 0
(-2/5)*t+12 = 0
12-2/5*t = 0 // - 12
-2/5*t = -12 // : -2/5
t = -12/(-2/5)
t = 30
t = 30
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