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t in (-oo:+oo)
3*t+6 = 6*t+42 // - 6*t+42
3*t-(6*t)-42+6 = 0
3*t-6*t-42+6 = 0
-3*t-36 = 0 // + 36
-3*t = 36 // : -3
t = 36/(-3)
t = -12
t = -12
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