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t in (-oo:+oo)
-79 = 3*t+6*t+2 // - 3*t+6*t+2
-(3*t)-(6*t)-79-2 = 0
-3*t-6*t-79-2 = 0
-9*t-81 = 0 // + 81
-9*t = 81 // : -9
t = 81/(-9)
t = -9
t = -9
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