2a-5=21

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Solution for 2a-5=21 equation: 



2a-5=21

We move all terms to the left:

2a-5-(21)=0

We add all the numbers together, and all the variables

2a-26=0

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

2a=26

a=26/2

a=13

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