7a+2a=7a+2a

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Solution for 7a+2a=7a+2a equation: 



7a+2a=7a+2a

We move all terms to the left:

7a+2a-(7a+2a)=0

We add all the numbers together, and all the variables

7a+2a-(+9a)=0

We add all the numbers together, and all the variables

9a-(+9a)=0

We get rid of parentheses

9a-9a=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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