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D( d )
d+12 = 0
d+3 = 0
d+12 = 0
d+12 = 0
d+12 = 0 // - 12
d = -12
d+3 = 0
d+3 = 0
d+3 = 0 // - 3
d = -3
d in (-oo:-12) U (-12:-3) U (-3:+oo)
3/(d+3) = 4/(d+12) // - 4/(d+12)
3/(d+3)-(4/(d+12)) = 0
3/(d+3)-4*(d+12)^-1 = 0
3/(d+3)-4/(d+12) = 0
(3*(d+12))/((d+3)*(d+12))+(-4*(d+3))/((d+3)*(d+12)) = 0
3*(d+12)-4*(d+3) = 0
24-d = 0
(24-d)/((d+3)*(d+12)) = 0
(24-d)/((d+3)*(d+12)) = 0 // * (d+3)*(d+12)
24-d = 0
24-d = 0 // - 24
-d = -24 // * -1
d = 24
d = 24
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