x=20+.2*(40+x)

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Solution for x=20+.2*(40+x) equation: 



x=20+.2(40+x)

We move all terms to the left:

x-(20+.2(40+x))=0

We add all the numbers together, and all the variables

x-(20+.2(x+40))=0



We calculate terms in parentheses: -(20+.2(x+40)), so:

20+.2(x+40)

determiningTheFunctionDomain
.2(x+40)+20

We multiply parentheses

0.2x+8+20

We add all the numbers together, and all the variables

0.2x+28

Back to the equation:

-(0.2x+28)



We get rid of parentheses

x-0.2x-28=0

We add all the numbers together, and all the variables

0.8x-28=0

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

0.8x=28

x=28/0.8

x=35

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