x=0.2(90-x)

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Solution for x=0.2(90-x) equation: 



x=0.2(90-x)

We move all terms to the left:

x-(0.2(90-x))=0

We add all the numbers together, and all the variables

x-(0.2(-1x+90))=0



We calculate terms in parentheses: -(0.2(-1x+90)), so:

0.2(-1x+90)

We multiply parentheses

-0.2x+18

Back to the equation:

-(-0.2x+18)



We get rid of parentheses

x+0.2x-18=0

We add all the numbers together, and all the variables

1.2x-18=0

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

1.2x=18

x=18/1.2

x=15

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