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t in (-oo:+oo)
6*(3*t-4) = -6 // + 6
6*(3*t-4)+6 = 0
6*(3*t-4)+6 = 0
18*t-18 = 0
18*t-18 = 0
18*t-18 = 0 // + 18
18*t = 18 // : 18
t = 18/18
t = 1
t = 1
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