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D( w )
w+3 = 0
2*w+6 = 0
w+3 = 0
w+3 = 0
w+3 = 0 // - 3
w = -3
2*w+6 = 0
2*w+6 = 0
2*w+6 = 0 // - 6
2*w = -6 // : 2
w = -6/2
w = -3
w in (-oo:-3) U (-3:+oo)
7/(2*w+6)+2 = -(3/(w+3)) // + 3/(w+3)
7/(2*w+6)+3/(w+3)+2 = 0
(7*(w+3))/((2*w+6)*(w+3))+(3*(2*w+6))/((2*w+6)*(w+3))+(2*(2*w+6)*(w+3))/((2*w+6)*(w+3)) = 0
7*(w+3)+3*(2*w+6)+2*(2*w+6)*(w+3) = 0
4*w^2+13*w+24*w+36+39 = 0
4*w^2+37*w+75 = 0
4*w^2+37*w+75 = 0
4*w^2+37*w+75 = 0
DELTA = 37^2-(4*4*75)
DELTA = 169
DELTA > 0
w = (169^(1/2)-37)/(2*4) or w = (-169^(1/2)-37)/(2*4)
w = -3 or w = -25/4
(w+25/4)*(w+3) = 0
((w+25/4)*(w+3))/((2*w+6)*(w+3)) = 0
((w+25/4)*(w+3))/((2*w+6)*(w+3)) = 0 // * (2*w+6)*(w+3)
(w+25/4)*(w+3) = 0
( w+25/4 )
w+25/4 = 0 // - 25/4
w = -25/4
( w+3 )
w+3 = 0 // - 3
w = -3
w in { -3}
w = -25/4
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