80=x+(x-20)

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Solution for 80=x+(x-20) equation: 



80=x+(x-20)

We move all terms to the left:

80-(x+(x-20))=0



We calculate terms in parentheses: -(x+(x-20)), so:

x+(x-20)

We get rid of parentheses

x+x-20

We add all the numbers together, and all the variables

2x-20

Back to the equation:

-(2x-20)



We get rid of parentheses

-2x+20+80=0

We add all the numbers together, and all the variables

-2x+100=0

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

-2x=-100

x=-100/-2

x=+50

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