7a-3=21

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Solution for 7a-3=21 equation: 



7a-3=21

We move all terms to the left:

7a-3-(21)=0

We add all the numbers together, and all the variables

7a-24=0

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

7a=24

a=24/7

a=3+3/7

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