X+(15+x)=255

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Solution for X+(15+x)=255 equation: 



X+(15+X)=255

We move all terms to the left:

X+(15+X)-(255)=0

We add all the numbers together, and all the variables

X+(X+15)-255=0

We get rid of parentheses

X+X+15-255=0

We add all the numbers together, and all the variables

2X-240=0

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

2X=240

X=240/2

X=120

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