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t in (-oo:+oo)
2*(3*t+5) = -8 // + 8
2*(3*t+5)+8 = 0
2*(3*t+5)+8 = 0
6*t+18 = 0
6*t+18 = 0
6*t+18 = 0 // - 18
6*t = -18 // : 6
t = -18/6
t = -3
t = -3
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