X+x+8=18

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Solution for X+x+8=18 equation: 



X+X+8=18

We move all terms to the left:

X+X+8-(18)=0

We add all the numbers together, and all the variables

2X-10=0

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

2X=10

X=10/2

X=5

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