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t in (-oo:+oo)
3*(6-(3*t)) = 117 // - 117
3*(6-(3*t))-117 = 0
3*(6-3*t)-117 = 0
3*(6-3*t)-117 = 0
-9*t-99 = 0
-9*t-99 = 0
-9*t-99 = 0 // + 99
-9*t = 99 // : -9
t = 99/(-9)
t = -11
t = -11
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