X+12+8+x=18

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Solution for X+12+8+x=18 equation: 



X+12+8+X=18

We move all terms to the left:

X+12+8+X-(18)=0

We add all the numbers together, and all the variables

2X+2=0

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

2X=-2

X=-2/2

X=-1

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