3a=8a-5(4a+9)

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Solution for 3a=8a-5(4a+9) equation: 



3a=8a-5(4a+9)

We move all terms to the left:

3a-(8a-5(4a+9))=0



We calculate terms in parentheses: -(8a-5(4a+9)), so:

8a-5(4a+9)

We multiply parentheses

8a-20a-45

We add all the numbers together, and all the variables

-12a-45

Back to the equation:

-(-12a-45)



We get rid of parentheses

3a+12a+45=0

We add all the numbers together, and all the variables

15a+45=0

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

15a=-45

a=-45/15

a=-3

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