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t in (-oo:+oo)
3*(t-3) = 18 // - 18
3*(t-3)-18 = 0
3*(t-3)-18 = 0
3*t-27 = 0
3*t-27 = 0
3*t-27 = 0 // + 27
3*t = 27 // : 3
t = 27/3
t = 9
t = 9
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