12a-7-3a=3+4a

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Solution for 12a-7-3a=3+4a equation: 



12a-7-3a=3+4a

We move all terms to the left:

12a-7-3a-(3+4a)=0

We add all the numbers together, and all the variables

12a-3a-(4a+3)-7=0

We add all the numbers together, and all the variables

9a-(4a+3)-7=0

We get rid of parentheses

9a-4a-3-7=0

We add all the numbers together, and all the variables

5a-10=0

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

5a=10

a=10/5

a=2

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