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t in (-oo:+oo)
6*(-7*t-9) = -306 // + 306
6*(-7*t-9)+306 = 0
6*(-7*t-9)+306 = 0
252-42*t = 0
252-42*t = 0
252-42*t = 0 // - 252
-42*t = -252 // : -42
t = -252/(-42)
t = 6
t = 6
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