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t in (-oo:+oo)
4*(6*t+3) = -276 // + 276
4*(6*t+3)+276 = 0
4*(6*t+3)+276 = 0
24*t+288 = 0
24*t+288 = 0
24*t+288 = 0 // - 288
24*t = -288 // : 24
t = -288/24
t = -12
t = -12
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