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t in (-oo:+oo)
6*(3-7*t) = -360 // + 360
6*(3-7*t)+360 = 0
6*(3-7*t)+360 = 0
378-42*t = 0
378-42*t = 0
378-42*t = 0 // - 378
-42*t = -378 // : -42
t = -378/(-42)
t = 9
t = 9
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