90-(8a+9)=(11+2a)

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Solution for 90-(8a+9)=(11+2a) equation: 



90-(8a+9)=(11+2a)

We move all terms to the left:

90-(8a+9)-((11+2a))=0

We add all the numbers together, and all the variables

-(8a+9)-((2a+11))+90=0

We get rid of parentheses

-8a-((2a+11))-9+90=0



We calculate terms in parentheses: -((2a+11)), so:

(2a+11)

We get rid of parentheses

2a+11

Back to the equation:

-(2a+11)



We add all the numbers together, and all the variables

-8a-(2a+11)+81=0

We get rid of parentheses

-8a-2a-11+81=0

We add all the numbers together, and all the variables

-10a+70=0

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

-10a=-70

a=-70/-10

a=+7

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