x=(100+x)*0.2

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Solution for x=(100+x)*0.2 equation: 



x=(100+x)*0.2

We move all terms to the left:

x-((100+x)*0.2)=0

We add all the numbers together, and all the variables

x-((x+100)*0.2)=0



We calculate terms in parentheses: -((x+100)*0.2), so:

(x+100)*0.2

We multiply parentheses

0.2x+20

Back to the equation:

-(0.2x+20)



We get rid of parentheses

x-0.2x-20=0

We add all the numbers together, and all the variables

0.8x-20=0

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

0.8x=20

x=20/0.8

x=25

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