7a-9a=23

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Solution for 7a-9a=23 equation: 



7a-9a=23

We move all terms to the left:

7a-9a-(23)=0

We add all the numbers together, and all the variables

-2a-23=0

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

-2a=23

a=23/-2

a=-11+1/2

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