6a+21=531

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Solution for 6a+21=531 equation: 



6a+21=531

We move all terms to the left:

6a+21-(531)=0

We add all the numbers together, and all the variables

6a-510=0

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

6a=510

a=510/6

a=85

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