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t in (-oo:+oo)
4*(2*t+9) = 60 // - 60
4*(2*t+9)-60 = 0
4*(2*t+9)-60 = 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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