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t in (-oo:+oo)
6*(5*t-5) = 300 // - 300
6*(5*t-5)-300 = 0
6*(5*t-5)-300 = 0
30*t-330 = 0
30*t-330 = 0
30*t-330 = 0 // + 330
30*t = 330 // : 30
t = 330/30
t = 11
t = 11
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