13=8a-3(2a+5)

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Solution for 13=8a-3(2a+5) equation: 



13=8a-3(2a+5)

We move all terms to the left:

13-(8a-3(2a+5))=0



We calculate terms in parentheses: -(8a-3(2a+5)), so:

8a-3(2a+5)

We multiply parentheses

8a-6a-15

We add all the numbers together, and all the variables

2a-15

Back to the equation:

-(2a-15)



We get rid of parentheses

-2a+15+13=0

We add all the numbers together, and all the variables

-2a+28=0

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

-2a=-28

a=-28/-2

a=+14

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