5a-21=4

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Solution for 5a-21=4 equation: 



5a-21=4

We move all terms to the left:

5a-21-(4)=0

We add all the numbers together, and all the variables

5a-25=0

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

5a=25

a=25/5

a=5

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