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w in (-oo:+oo)
w*((w-4)/4) = 1/5 // - 1/5
w*((w-4)/4)-(1/5) = 0
w*((w-4)/4)-1/5 = 0
(w*(w-4))/4-1/5 = 0
(5*w*(w-4))/(4*5)+(-1*4)/(4*5) = 0
5*w*(w-4)-1*4 = 0
5*w^2-20*w-4 = 0
5*w^2-20*w-4 = 0
5*w^2-20*w-4 = 0
DELTA = (-20)^2-(-4*4*5)
DELTA = 480
DELTA > 0
w = (480^(1/2)+20)/(2*5) or w = (20-480^(1/2))/(2*5)
w = (4*30^(1/2)+20)/10 or w = (20-4*30^(1/2))/10
(w-((20-4*30^(1/2))/10))*(w-((4*30^(1/2)+20)/10)) = 0
((w-((20-4*30^(1/2))/10))*(w-((4*30^(1/2)+20)/10)))/(4*5) = 0
((w-((20-4*30^(1/2))/10))*(w-((4*30^(1/2)+20)/10)))/(4*5) = 0 // * 4*5
(w-((20-4*30^(1/2))/10))*(w-((4*30^(1/2)+20)/10)) = 0
( w-((20-4*30^(1/2))/10) )
w-((20-4*30^(1/2))/10) = 0 // + (20-4*30^(1/2))/10
w = (20-4*30^(1/2))/10
( w-((4*30^(1/2)+20)/10) )
w-((4*30^(1/2)+20)/10) = 0 // + (4*30^(1/2)+20)/10
w = (4*30^(1/2)+20)/10
w in { (20-4*30^(1/2))/10, (4*30^(1/2)+20)/10 }
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