90=9(a+5)

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Solution for 90=9(a+5) equation: 



90=9(a+5)

We move all terms to the left:

90-(9(a+5))=0



We calculate terms in parentheses: -(9(a+5)), so:

9(a+5)

We multiply parentheses

9a+45

Back to the equation:

-(9a+45)



We get rid of parentheses

-9a-45+90=0

We add all the numbers together, and all the variables

-9a+45=0

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

-9a=-45

a=-45/-9

a=+5

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