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t in (-oo:+oo)
3*(-(3*t)-6) = -45 // + 45
3*(-(3*t)-6)+45 = 0
3*(-3*t-6)+45 = 0
3*(-3*t-6)+45 = 0
27-9*t = 0
27-9*t = 0
27-9*t = 0 // - 27
-9*t = -27 // : -9
t = -27/(-9)
t = 3
t = 3
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