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t in (-oo:+oo)
39 = t+6*t-3 // - t+6*t-3
3-t-(6*t)+39 = 0
3-t-6*t+39 = 0
42-7*t = 0 // - 42
-7*t = -42 // : -7
t = -42/(-7)
t = 6
t = 6
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