-138=-7a+23

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Solution for -138=-7a+23 equation: 



-138=-7a+23

We move all terms to the left:

-138-(-7a+23)=0

We get rid of parentheses

7a-23-138=0

We add all the numbers together, and all the variables

7a-161=0

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

7a=161

a=161/7

a=23

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