0=9a-4(2a+5)

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Solution for 0=9a-4(2a+5) equation: 



0=9a-4(2a+5)

We move all terms to the left:

0-(9a-4(2a+5))=0

We add all the numbers together, and all the variables

-(9a-4(2a+5))=0



We calculate terms in parentheses: -(9a-4(2a+5)), so:

9a-4(2a+5)

We multiply parentheses

9a-8a-20

We add all the numbers together, and all the variables

a-20

Back to the equation:

-(a-20)



We get rid of parentheses

-a+20=0

We add all the numbers together, and all the variables

-1a+20=0

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

-a=-20

a=-20/-1

a=+20

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