7a+16-3a-7=21

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Solution for 7a+16-3a-7=21 equation: 



7a+16-3a-7=21

We move all terms to the left:

7a+16-3a-7-(21)=0

We add all the numbers together, and all the variables

4a-12=0

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

4a=12

a=12/4

a=3

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