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t in (-oo:+oo)
3*(5*t-8) = 141 // - 141
3*(5*t-8)-141 = 0
3*(5*t-8)-141 = 0
15*t-165 = 0
15*t-165 = 0
15*t-165 = 0 // + 165
15*t = 165 // : 15
t = 165/15
t = 11
t = 11
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