-21+7a=28

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Solution for -21+7a=28 equation: 



-21+7a=28

We move all terms to the left:

-21+7a-(28)=0

We add all the numbers together, and all the variables

7a-49=0

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

7a=49

a=49/7

a=7

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