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t in (-oo:+oo)
6*t+9 = 3*t+42 // - 3*t+42
6*t-(3*t)-42+9 = 0
6*t-3*t-42+9 = 0
3*t-33 = 0 // + 33
3*t = 33 // : 3
t = 33/3
t = 11
t = 11
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