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t in (-oo:+oo)
5*(4*t+6) = 270 // - 270
5*(4*t+6)-270 = 0
5*(4*t+6)-270 = 0
20*t-240 = 0
20*t-240 = 0
20*t-240 = 0 // + 240
20*t = 240 // : 20
t = 240/20
t = 12
t = 12
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