(100-x)=(40+2x)

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Solution for (100-x)=(40+2x) equation: 



(100-x)=(40+2x)

We move all terms to the left:

(100-x)-((40+2x))=0

We add all the numbers together, and all the variables

(-1x+100)-((2x+40))=0

We get rid of parentheses

-1x-((2x+40))+100=0



We calculate terms in parentheses: -((2x+40)), so:

(2x+40)

We get rid of parentheses

2x+40

Back to the equation:

-(2x+40)



We get rid of parentheses

-1x-2x-40+100=0

We add all the numbers together, and all the variables

-3x+60=0

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

-3x=-60

x=-60/-3

x=+20

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