X+12+x=540

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Solution for X+12+x=540 equation: 



X+12+X=540

We move all terms to the left:

X+12+X-(540)=0

We add all the numbers together, and all the variables

2X-528=0

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

2X=528

X=528/2

X=264

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