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t in (-oo:+oo)
6*(5-5*t) = -330 // + 330
6*(5-5*t)+330 = 0
6*(5-5*t)+330 = 0
360-30*t = 0
360-30*t = 0
360-30*t = 0 // - 360
-30*t = -360 // : -30
t = -360/(-30)
t = 12
t = 12
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