5a-15=12-4a

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Solution for 5a-15=12-4a equation: 



5a-15=12-4a

We move all terms to the left:

5a-15-(12-4a)=0

We add all the numbers together, and all the variables

5a-(-4a+12)-15=0

We get rid of parentheses

5a+4a-12-15=0

We add all the numbers together, and all the variables

9a-27=0

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

9a=27

a=27/9

a=3

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