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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