7a+9=3a-9

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Solution for 7a+9=3a-9 equation: 



7a+9=3a-9

We move all terms to the left:

7a+9-(3a-9)=0

We get rid of parentheses

7a-3a+9+9=0

We add all the numbers together, and all the variables

4a+18=0

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

4a=-18

a=-18/4

a=-4+1/2

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