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t in (-oo:+oo)
(t/2-20)/4 = 4 // - 4
(t/2-20)/4-4 = 0
(1/2*t-20)/4-4 = 0
(1/2*t-20)/4+(-4*4)/4 = 0
1/2*t-4*4-20 = 0
1/2*t-36 = 0
(1/2*t-36)/4 = 0
(1/2*t-36)/4 = 0 // * 4
1/2*t-36 = 0
1/2*t-36 = 0 // + 36
1/2*t = 36 // : 1/2
t = 36/1/2
t = 72
t = 72
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