X+x+42=66

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Solution for X+x+42=66 equation: 



X+X+42=66

We move all terms to the left:

X+X+42-(66)=0

We add all the numbers together, and all the variables

2X-24=0

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

2X=24

X=24/2

X=12

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