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