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t in (-oo:+oo)
3*t+9 = 72-6*t // - 72-6*t
3*t-(-6*t)-72+9 = 0
3*t+6*t-72+9 = 0
9*t-63 = 0 // + 63
9*t = 63 // : 9
t = 63/9
t = 7
t = 7
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