7a+8=21=4a

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Solution for 7a+8=21=4a equation: 



7a+8=21=4a

We move all terms to the left:

7a+8-(21)=0

We add all the numbers together, and all the variables

7a-13=0

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

7a=13

a=13/7

a=1+6/7

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