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t in (-oo:+oo)
6*(5*t+6) = 396 // - 396
6*(5*t+6)-396 = 0
6*(5*t+6)-396 = 0
30*t-360 = 0
30*t-360 = 0
30*t-360 = 0 // + 360
30*t = 360 // : 30
t = 360/30
t = 12
t = 12
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