X+x-2=18

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Solution for X+x-2=18 equation: 



X+X-2=18

We move all terms to the left:

X+X-2-(18)=0

We add all the numbers together, and all the variables

2X-20=0

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

2X=20

X=20/2

X=10

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