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t in (-oo:+oo)
6*t-(2*t)+4 = -12 // + 12
6*t-(2*t)+4+12 = 0
6*t-2*t+4+12 = 0
4*t+16 = 0 // - 16
4*t = -16 // : 4
t = -16/4
t = -4
t = -4
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