-21=9d-7d

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Solution for -21=9d-7d equation:


-21=9d-7d

We simplify the equation to the form, which is simple to understand 
-21=9d-7d

We move all terms containing d to the left and all other terms to the right. 
-9d+7d=+21

We simplify left and right side of the equation. 
-2d=+21

We divide both sides of the equation by -2 to get d. 
d=-10.5

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