4a-(3+a)=9

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Solution for 4a-(3+a)=9 equation: 



4a-(3+a)=9

We move all terms to the left:

4a-(3+a)-(9)=0

We add all the numbers together, and all the variables

4a-(a+3)-9=0

We get rid of parentheses

4a-a-3-9=0

We add all the numbers together, and all the variables

3a-12=0

We move all terms containing a to the left, all other terms to the right

3a=12

a=12/3

a=4

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