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t in (-oo:+oo)
3*(1-(5*t)) = -147 // + 147
3*(1-(5*t))+147 = 0
3*(1-5*t)+147 = 0
3*(1-5*t)+147 = 0
150-15*t = 0
150-15*t = 0
150-15*t = 0 // - 150
-15*t = -150 // : -15
t = -150/(-15)
t = 10
t = 10
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