X+(x-1)=13

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Solution for X+(x-1)=13 equation: 



X+(X-1)=13

We move all terms to the left:

X+(X-1)-(13)=0

We get rid of parentheses

X+X-1-13=0

We add all the numbers together, and all the variables

2X-14=0

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

2X=14

X=14/2

X=7

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