90=x+20+(x+10)

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Solution for 90=x+20+(x+10) equation: 



90=x+20+(x+10)

We move all terms to the left:

90-(x+20+(x+10))=0



We calculate terms in parentheses: -(x+20+(x+10)), so:

x+20+(x+10)

determiningTheFunctionDomain
x+(x+10)+20

We get rid of parentheses

x+x+10+20

We add all the numbers together, and all the variables

2x+30

Back to the equation:

-(2x+30)



We get rid of parentheses

-2x-30+90=0

We add all the numbers together, and all the variables

-2x+60=0

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

-2x=-60

x=-60/-2

x=+30

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