X+123=2y

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Solution for X+123=2y equation: 



X+123=2X

We move all terms to the left:

X+123-(2X)=0

We add all the numbers together, and all the variables

-1X+123=0

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

-X=-123

X=-123/-1

X=+123

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