5a-9=-2a+12

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Solution for 5a-9=-2a+12 equation: 



5a-9=-2a+12

We move all terms to the left:

5a-9-(-2a+12)=0

We get rid of parentheses

5a+2a-12-9=0

We add all the numbers together, and all the variables

7a-21=0

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

7a=21

a=21/7

a=3

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