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t in (-oo:+oo)
3-(6*t) = 30-3*t // - 30-3*t
3-(6*t)-(-3*t)-30 = 0
3*t-6*t-30+3 = 0
-3*t-27 = 0 // + 27
-3*t = 27 // : -3
t = 27/(-3)
t = -9
t = -9
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