7a-4=21

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Solution for 7a-4=21 equation: 



7a-4=21

We move all terms to the left:

7a-4-(21)=0

We add all the numbers together, and all the variables

7a-25=0

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

7a=25

a=25/7

a=3+4/7

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