3a=5a+21

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Solution for 3a=5a+21 equation: 



3a=5a+21

We move all terms to the left:

3a-(5a+21)=0

We get rid of parentheses

3a-5a-21=0

We add all the numbers together, and all the variables

-2a-21=0

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

-2a=21

a=21/-2

a=-10+1/2

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