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t in (-oo:+oo)
4*(2*t+4) = 80 // - 80
4*(2*t+4)-80 = 0
4*(2*t+4)-80 = 0
8*t-64 = 0
8*t-64 = 0
8*t-64 = 0 // + 64
8*t = 64 // : 8
t = 64/8
t = 8
t = 8
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