3/(d+3)=4/(d+12)

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Solution for 3/(d+3)=4/(d+12) equation: 


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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