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w in (-oo:+oo)
4/7 = w*((2-3*w)/(-2)) // - w*((2-3*w)/(-2))
4/7-(w*((2-3*w)/(-2))) = 0
(-1*w*(2-3*w))/(-2)+4/7 = 0
(-1*7*w*(2-3*w))/(-2*7)+(-2*4)/(-2*7) = 0
-1*7*w*(2-3*w)-2*4 = 0
21*w^2-14*w-8 = 0
21*w^2-14*w-8 = 0
21*w^2-14*w-8 = 0
DELTA = (-14)^2-(-8*4*21)
DELTA = 868
DELTA > 0
w = (868^(1/2)+14)/(2*21) or w = (14-868^(1/2))/(2*21)
w = (2*217^(1/2)+14)/42 or w = (14-2*217^(1/2))/42
(w-((14-2*217^(1/2))/42))*(w-((2*217^(1/2)+14)/42)) = 0
((w-((14-2*217^(1/2))/42))*(w-((2*217^(1/2)+14)/42)))/(-2*7) = 0
((w-((14-2*217^(1/2))/42))*(w-((2*217^(1/2)+14)/42)))/(-2*7) = 0 // * -2*7
(w-((14-2*217^(1/2))/42))*(w-((2*217^(1/2)+14)/42)) = 0
( w-((14-2*217^(1/2))/42) )
w-((14-2*217^(1/2))/42) = 0 // + (14-2*217^(1/2))/42
w = (14-2*217^(1/2))/42
( w-((2*217^(1/2)+14)/42) )
w-((2*217^(1/2)+14)/42) = 0 // + (2*217^(1/2)+14)/42
w = (2*217^(1/2)+14)/42
w in { (14-2*217^(1/2))/42, (2*217^(1/2)+14)/42 }
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