-31=9-4x

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Solution for -31=9-4x equation: 



-31=9-4x

We move all terms to the left:

-31-(9-4x)=0

We add all the numbers together, and all the variables

-(-4x+9)-31=0

We get rid of parentheses

4x-9-31=0

We add all the numbers together, and all the variables

4x-40=0

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

4x=40

x=40/4

x=10

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