3a+21=60

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Solution for 3a+21=60 equation: 



3a+21=60

We move all terms to the left:

3a+21-(60)=0

We add all the numbers together, and all the variables

3a-39=0

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

3a=39

a=39/3

a=13

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