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d in (-oo:+oo)
(4/3)*(15*d-60) = 320 // - 320
(4/3)*(15*d-60)-320 = 0
4/3*(15*d-60)-320 = 0
4/3*(15*d-60)-320 = 0
20*d-400 = 0
20*d-400 = 0
20*d-400 = 0 // + 400
20*d = 400 // : 20
d = 400/20
d = 20
d = 20
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