3a+6=2a+21

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Solution for 3a+6=2a+21 equation: 



3a+6=2a+21

We move all terms to the left:

3a+6-(2a+21)=0

We get rid of parentheses

3a-2a-21+6=0

We add all the numbers together, and all the variables

a-15=0

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

a=15

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