2a-9=4a+15

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Solution for 2a-9=4a+15 equation: 



2a-9=4a+15

We move all terms to the left:

2a-9-(4a+15)=0

We get rid of parentheses

2a-4a-15-9=0

We add all the numbers together, and all the variables

-2a-24=0

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

-2a=24

a=24/-2

a=-12

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