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D( w )
2*w+4 = 0
w-10 = 0
2*w+4 = 0
2*w+4 = 0
2*w+4 = 0 // - 4
2*w = -4 // : 2
w = -4/2
w = -2
w-10 = 0
w-10 = 0
w-10 = 0 // + 10
w = 10
w in (-oo:-2) U (-2:10) U (10:+oo)
6/(2*w+4) = -2/(w-10) // + -2/(w-10)
6/(2*w+4)-(-2/(w-10)) = 0
6/(2*w+4)+2*(w-10)^-1 = 0
6/(2*w+4)+2/(w-10) = 0
(6*(w-10))/((2*w+4)*(w-10))+(2*(2*w+4))/((2*w+4)*(w-10)) = 0
6*(w-10)+2*(2*w+4) = 0
10*w-52 = 0
(10*w-52)/((2*w+4)*(w-10)) = 0
(10*w-52)/((2*w+4)*(w-10)) = 0 // * (2*w+4)*(w-10)
10*w-52 = 0
10*w-52 = 0 // + 52
10*w = 52 // : 10
w = 52/10
w = 26/5
w = 26/5
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