9=13-4x

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Solution for 9=13-4x equation: 



9=13-4x

We move all terms to the left:

9-(13-4x)=0

We add all the numbers together, and all the variables

-(-4x+13)+9=0

We get rid of parentheses

4x-13+9=0

We add all the numbers together, and all the variables

4x-4=0

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

4x=4

x=4/4

x=1

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