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t in (-oo:+oo)
3*(7*t-6) = 87 // - 87
3*(7*t-6)-87 = 0
3*(7*t-6)-87 = 0
21*t-105 = 0
21*t-105 = 0
21*t-105 = 0 // + 105
21*t = 105 // : 21
t = 105/21
t = 5
t = 5
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