9+3x+x=13

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Solution for 9+3x+x=13 equation: 



9+3x+x=13

We move all terms to the left:

9+3x+x-(13)=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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