X+x-30=12x

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Solution for X+x-30=12x equation: 



X+X-30=12X

We move all terms to the left:

X+X-30-(12X)=0

We add all the numbers together, and all the variables

-10X-30=0

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

-10X=30

X=30/-10

X=-3

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