21=a-76

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Solution for 21=a-76 equation: 



21=a-76

We move all terms to the left:

21-(a-76)=0

We get rid of parentheses

-a+76+21=0

We add all the numbers together, and all the variables

-1a+97=0

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

-a=-97

a=-97/-1

a=+97

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