X+(x-40)=100

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Solution for X+(x-40)=100 equation: 



X+(X-40)=100

We move all terms to the left:

X+(X-40)-(100)=0

We get rid of parentheses

X+X-40-100=0

We add all the numbers together, and all the variables

2X-140=0

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

2X=140

X=140/2

X=70

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