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t in (-oo:+oo)
15 = 3*t-6*t-9 // - 3*t-6*t-9
9-(-6*t)-(3*t)+15 = 0
6*t-3*t+9+15 = 0
3*t+24 = 0 // - 24
3*t = -24 // : 3
t = -24/3
t = -8
t = -8
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