2a-9=4a-9

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



2a-9=4a-9

We move all terms to the left:

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

We get rid of parentheses

2a-4a+9-9=0

We add all the numbers together, and all the variables

-2a=0

a=0/-2

a=0

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