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d in (-oo:+oo)
d/20+1 = d/24+1/4+1 // - d/24+1/4+1
d/20-(d/24)-(1/4)-1+1 = 0
d/20-(d/24)-1/4-1+1 = 0
1/120*d-1/4 = 0 // + 1/4
1/120*d = 1/4 // : 1/120
d = 1/4/1/120
d = 30
d = 30
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