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t in (-oo:+oo)
4*(3*t+9) = -60 // + 60
4*(3*t+9)+60 = 0
4*(3*t+9)+60 = 0
12*t+96 = 0
12*t+96 = 0
12*t+96 = 0 // - 96
12*t = -96 // : 12
t = -96/12
t = -8
t = -8
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