4a-(3-a)=12

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Solution for 4a-(3-a)=12 equation: 



4a-(3-a)=12

We move all terms to the left:

4a-(3-a)-(12)=0

We add all the numbers together, and all the variables

4a-(-1a+3)-12=0

We get rid of parentheses

4a+1a-3-12=0

We add all the numbers together, and all the variables

5a-15=0

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

5a=15

a=15/5

a=3

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