a+9=2a-4

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



a+9=2a-4

We move all terms to the left:

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

We get rid of parentheses

a-2a+4+9=0

We add all the numbers together, and all the variables

-1a+13=0

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

-a=-13

a=-13/-1

a=+13

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