X+x+4+x+8=54

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Solution for X+x+4+x+8=54 equation: 



X+X+4+X+8=54

We move all terms to the left:

X+X+4+X+8-(54)=0

We add all the numbers together, and all the variables

3X-42=0

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

3X=42

X=42/3

X=14

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