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t in (-oo:+oo)
4*(9-2*t) = -12 // + 12
4*(9-2*t)+12 = 0
4*(9-2*t)+12 = 0
48-8*t = 0
48-8*t = 0
48-8*t = 0 // - 48
-8*t = -48 // : -8
t = -48/(-8)
t = 6
t = 6
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