3a+7(a-3)=

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


3a+7(a-3)=0

We simplify the equation to the form, which is simple to understand 
3a+7(a-3)=0

Reorder the terms in parentheses
3a+(+7a-21)=0

Remove unnecessary parentheses
+3a+7a-21=0

We move all terms containing a to the left and all other terms to the right. 
+3a+7a=0+21

We simplify left and right side of the equation. 
+10a=+21

We divide both sides of the equation by 10 to get a. 
a=2.1

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