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t in (-oo:+oo)
6*(3-(5*t)) = -222 // + 222
6*(3-(5*t))+222 = 0
6*(3-5*t)+222 = 0
6*(3-5*t)+222 = 0
240-30*t = 0
240-30*t = 0
240-30*t = 0 // - 240
-30*t = -240 // : -30
t = -240/(-30)
t = 8
t = 8
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