A=7-21a

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Solution for A=7-21a equation:


a=7-21a

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

We move all terms containing a to the left and all other terms to the right. 
+1a+21a=+7

We simplify left and right side of the equation. 
+22a=+7

We divide both sides of the equation by 22 to get a. 
a=0.318181818182

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