4*a+5=21

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Solution for 4*a+5=21 equation: 



4a+5=21

We move all terms to the left:

4a+5-(21)=0

We add all the numbers together, and all the variables

4a-16=0

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

4a=16

a=16/4

a=4

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