4a+5=2a+21

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Solution for 4a+5=2a+21 equation: 



4a+5=2a+21

We move all terms to the left:

4a+5-(2a+21)=0

We get rid of parentheses

4a-2a-21+5=0

We add all the numbers together, and all the variables

2a-16=0

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

2a=16

a=16/2

a=8

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