X-(100-x)=30

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Solution for X-(100-x)=30 equation: 



X-(100-X)=30

We move all terms to the left:

X-(100-X)-(30)=0

We add all the numbers together, and all the variables

X-(-1X+100)-30=0

We get rid of parentheses

X+1X-100-30=0

We add all the numbers together, and all the variables

2X-130=0

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

2X=130

X=130/2

X=65

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