20=5(a+9)

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Solution for 20=5(a+9) equation: 



20=5(a+9)

We move all terms to the left:

20-(5(a+9))=0



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

5(a+9)

We multiply parentheses

5a+45

Back to the equation:

-(5a+45)



We get rid of parentheses

-5a-45+20=0

We add all the numbers together, and all the variables

-5a-25=0

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

-5a=25

a=25/-5

a=-5

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