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t in (-oo:+oo)
6*t+2 = 4*t+12 // - 4*t+12
6*t-(4*t)-12+2 = 0
6*t-4*t-12+2 = 0
2*t-10 = 0 // + 10
2*t = 10 // : 2
t = 10/2
t = 5
t = 5
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