-15+9d=21

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Solution for -15+9d=21 equation:


-15+9d=21

We simplify the equation to the form, which is simple to understand 
-15+9d=21

We move all terms containing d to the left and all other terms to the right. 
+9d=+21+15

We simplify left and right side of the equation. 
+9d=+36

We divide both sides of the equation by 9 to get d. 
d=4

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