X+x+x+x=13

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Solution for X+x+x+x=13 equation: 



X+X+X+X=13

We move all terms to the left:

X+X+X+X-(13)=0

We add all the numbers together, and all the variables

4X-13=0

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

4X=13

X=13/4

X=3+1/4

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