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t in (-oo:+oo)
4*(2*t+9) = 12 // - 12
4*(2*t+9)-12 = 0
4*(2*t+9)-12 = 0
8*t+24 = 0
8*t+24 = 0
8*t+24 = 0 // - 24
8*t = -24 // : 8
t = -24/8
t = -3
t = -3
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