660=(x-90)+x

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Solution for 660=(x-90)+x equation: 



660=(x-90)+x

We move all terms to the left:

660-((x-90)+x)=0



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

(x-90)+x

We add all the numbers together, and all the variables

x+(x-90)

We get rid of parentheses

x+x-90

We add all the numbers together, and all the variables

2x-90

Back to the equation:

-(2x-90)



We get rid of parentheses

-2x+90+660=0

We add all the numbers together, and all the variables

-2x+750=0

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

-2x=-750

x=-750/-2

x=+375

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