a+9=2a-3

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Solution for a+9=2a-3 equation: 



a+9=2a-3

We move all terms to the left:

a+9-(2a-3)=0

We get rid of parentheses

a-2a+3+9=0

We add all the numbers together, and all the variables

-1a+12=0

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

-a=-12

a=-12/-1

a=+12

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