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t in (-oo:+oo)
4*(3-3*t) = -48 // + 48
4*(3-3*t)+48 = 0
4*(3-3*t)+48 = 0
60-12*t = 0
60-12*t = 0
60-12*t = 0 // - 60
-12*t = -60 // : -12
t = -60/(-12)
t = 5
t = 5
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