3a+21=2a+8

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Solution for 3a+21=2a+8 equation: 



3a+21=2a+8

We move all terms to the left:

3a+21-(2a+8)=0

We get rid of parentheses

3a-2a-8+21=0

We add all the numbers together, and all the variables

a+13=0

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

a=-13

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