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t in (-oo:+oo)
4*(t/4-2) = 20 // - 20
4*(t/4-2)-20 = 0
4*(1/4*t-2)-20 = 0
4*(1/4*t-2)-20 = 0
t-28 = 0
t-28 = 0
t-28 = 0 // + 28
t = 28
t = 28
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