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t in (-oo:+oo)
-66 = 6*t+6*t-6 // - 6*t+6*t-6
6-(6*t)-(6*t)-66 = 0
6-6*t-6*t-66 = 0
-12*t-60 = 0 // + 60
-12*t = 60 // : -12
t = 60/(-12)
t = -5
t = -5
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