5a-15=2a+21

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Solution for 5a-15=2a+21 equation: 



5a-15=2a+21

We move all terms to the left:

5a-15-(2a+21)=0

We get rid of parentheses

5a-2a-21-15=0

We add all the numbers together, and all the variables

3a-36=0

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

3a=36

a=36/3

a=12

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