d*2(10)=420.5

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Solution for d*2(10)=420.5 equation:


d*2(10)=420.5

We simplify the equation to the form, which is simple to understand 
d*2(10)=420.5

Simplifying:
+2d*(10)=420.5

Reorder the terms in parentheses
+(+20d)=420.5

Remove unnecessary parentheses
+20d=+420.5

We move all terms containing d to the left and all other terms to the right. 
+20d=+420.5

We simplify left and right side of the equation. 
+20d=+420.5

We divide both sides of the equation by 20 to get d. 
d=21.025

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