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t in (-oo:+oo)
(4*(t-3))/2 = 20 // - 20
(4*(t-3))/2-20 = 0
(4*(t-3))/2+(-20*2)/2 = 0
4*(t-3)-20*2 = 0
4*t-52 = 0
(4*t-52)/2 = 0
(4*t-52)/2 = 0 // * 2
4*t-52 = 0
4*t-52 = 0 // + 52
4*t = 52 // : 4
t = 52/4
t = 13
t = 13
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