990=(2.5x)-x

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Solution for 990=(2.5x)-x equation: 



990=(2.5x)-x

We move all terms to the left:

990-((2.5x)-x)=0

We add all the numbers together, and all the variables

-((+2.5x)-x)+990=0



We calculate terms in parentheses: -((+2.5x)-x), so:

(+2.5x)-x

We add all the numbers together, and all the variables

-1x+(+2.5x)

We get rid of parentheses

-1x+2.5x

We add all the numbers together, and all the variables

1.5x

Back to the equation:

-(1.5x)



We add all the numbers together, and all the variables

-(+1.5x)+990=0

We get rid of parentheses

-1.5x+990=0

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

-1.5x=-990

x=-990/-1.5

x=+660

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