X+(x+123)=519

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Solution for X+(x+123)=519 equation: 



X+(X+123)=519

We move all terms to the left:

X+(X+123)-(519)=0

We get rid of parentheses

X+X+123-519=0

We add all the numbers together, and all the variables

2X-396=0

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

2X=396

X=396/2

X=198

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