2a-12=21-5a

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Solution for 2a-12=21-5a equation: 



2a-12=21-5a

We move all terms to the left:

2a-12-(21-5a)=0

We add all the numbers together, and all the variables

2a-(-5a+21)-12=0

We get rid of parentheses

2a+5a-21-12=0

We add all the numbers together, and all the variables

7a-33=0

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

7a=33

a=33/7

a=4+5/7

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