-9x-138=42-15x

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Solution for -9x-138=42-15x equation: 



-9x-138=42-15x

We move all terms to the left:

-9x-138-(42-15x)=0

We add all the numbers together, and all the variables

-9x-(-15x+42)-138=0

We get rid of parentheses

-9x+15x-42-138=0

We add all the numbers together, and all the variables

6x-180=0

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

6x=180

x=180/6

x=30

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