(4a+1)=21

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Solution for (4a+1)=21 equation: 



(4a+1)=21

We move all terms to the left:

(4a+1)-(21)=0

We get rid of parentheses

4a+1-21=0

We add all the numbers together, and all the variables

4a-20=0

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

4a=20

a=20/4

a=5

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