2a-66=a-21

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Solution for 2a-66=a-21 equation: 



2a-66=a-21

We move all terms to the left:

2a-66-(a-21)=0

We get rid of parentheses

2a-a+21-66=0

We add all the numbers together, and all the variables

a-45=0

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

a=45

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