84=-3(1+7a)+3

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Solution for 84=-3(1+7a)+3 equation:


84=-3(1+7a)+3

We simplify the equation to the form, which is simple to understand 
84=-3(1+7a)+3

Reorder the terms in parentheses
84=+(-3-21a)+3

Remove unnecessary parentheses
+84=-3-21a+3

We move all terms containing a to the left and all other terms to the right. 
+21a=-3+3-84

We simplify left and right side of the equation. 
+21a=-84

We divide both sides of the equation by 021 to get a. 
a=-4

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