-(-100-40)=x

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



-(-100-40)=x

We move all terms to the left:

-(-100-40)-(x)=0

We add all the numbers together, and all the variables

-x-(-140)=0

We add all the numbers together, and all the variables

-1x+140=0

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

-x=-140

x=-140/-1

x=+140

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