X+(x-1)=138

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Solution for X+(x-1)=138 equation: 



X+(X-1)=138

We move all terms to the left:

X+(X-1)-(138)=0

We get rid of parentheses

X+X-1-138=0

We add all the numbers together, and all the variables

2X-139=0

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

2X=139

X=139/2

X=69+1/2

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