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t in (-oo:+oo)
3*(8-6*t) = -156 // + 156
3*(8-6*t)+156 = 0
3*(8-6*t)+156 = 0
180-18*t = 0
180-18*t = 0
180-18*t = 0 // - 180
-18*t = -180 // : -18
t = -180/(-18)
t = 10
t = 10
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