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t in (-oo:+oo)
6*(3*t-6) = -198 // + 198
6*(3*t-6)+198 = 0
6*(3*t-6)+198 = 0
18*t+162 = 0
18*t+162 = 0
18*t+162 = 0 // - 162
18*t = -162 // : 18
t = -162/18
t = -9
t = -9
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