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t in (-oo:+oo)
6*(9-2*t) = 150 // - 150
6*(9-2*t)-150 = 0
6*(9-2*t)-150 = 0
-12*t-96 = 0
-12*t-96 = 0
-12*t-96 = 0 // + 96
-12*t = 96 // : -12
t = 96/(-12)
t = -8
t = -8
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