(x)=(400+20)(90-1x)

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Solution for (x)=(400+20)(90-1x) equation: 



(x)=(400+20)(90-1x)

We move all terms to the left:

(x)-((400+20)(90-1x))=0

We add all the numbers together, and all the variables

x-(420(-1x+90))=0



We calculate terms in parentheses: -(420(-1x+90)), so:

420(-1x+90)

We multiply parentheses

-420x+37800

Back to the equation:

-(-420x+37800)



We get rid of parentheses

x+420x-37800=0

We add all the numbers together, and all the variables

421x-37800=0

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

421x=37800

x=37800/421

x=89+331/421

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