-9=x+3=8

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Solution for -9=x+3=8 equation: 



-9=x+3=8

We move all terms to the left:

-9-(x+3)=0

We get rid of parentheses

-x-3-9=0

We add all the numbers together, and all the variables

-1x-12=0

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

-x=12

x=12/-1

x=-12

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