-9+3(1+5d)=-21

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Solution for -9+3(1+5d)=-21 equation:


-9+3(1+5d)=-21

We simplify the equation to the form, which is simple to understand 
-9+3(1+5d)=-21

Reorder the terms in parentheses
-9+(+3+15d)=-21

Remove unnecessary parentheses
-9+3+15d=-21

We move all terms containing d to the left and all other terms to the right. 
+15d=-21+9-3

We simplify left and right side of the equation. 
+15d=-15

We divide both sides of the equation by 15 to get d. 
d=-1

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