81=5a+21

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Solution for 81=5a+21 equation: 



81=5a+21

We move all terms to the left:

81-(5a+21)=0

We get rid of parentheses

-5a-21+81=0

We add all the numbers together, and all the variables

-5a+60=0

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

-5a=-60

a=-60/-5

a=+12

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