x+9+13+x=20

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Solution for x+9+13+x=20 equation: 



x+9+13+x=20

We move all terms to the left:

x+9+13+x-(20)=0

We add all the numbers together, and all the variables

2x+2=0

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

2x=-2

x=-2/2

x=-1

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