X+x-5+x+8=138

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Solution for X+x-5+x+8=138 equation: 



X+X-5+X+8=138

We move all terms to the left:

X+X-5+X+8-(138)=0

We add all the numbers together, and all the variables

3X-135=0

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

3X=135

X=135/3

X=45

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