21=3d

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Solution for 21=3d equation:


21=3d

We simplify the equation to the form, which is simple to understand 
21=3d

We move all terms containing d to the left and all other terms to the right. 
-3d=-21

We simplify left and right side of the equation. 
-3d=-21

We divide both sides of the equation by -03 to get d. 
d=7

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