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t in (-oo:+oo)
2*(6*t+6) = -24 // + 24
2*(6*t+6)+24 = 0
2*(6*t+6)+24 = 0
12*t+36 = 0
12*t+36 = 0
12*t+36 = 0 // - 36
12*t = -36 // : 12
t = -36/12
t = -3
t = -3
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