9a-7a+4a-2a=4a

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Solution for 9a-7a+4a-2a=4a equation: 



9a-7a+4a-2a=4a

We move all terms to the left:

9a-7a+4a-2a-(4a)=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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