13-7a=5(-3-7a)

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Solution for 13-7a=5(-3-7a) equation: 



13-7a=5(-3-7a)

We move all terms to the left:

13-7a-(5(-3-7a))=0

We add all the numbers together, and all the variables

-7a-(5(-7a-3))+13=0



We calculate terms in parentheses: -(5(-7a-3)), so:

5(-7a-3)

We multiply parentheses

-35a-15

Back to the equation:

-(-35a-15)



We get rid of parentheses

-7a+35a+15+13=0

We add all the numbers together, and all the variables

28a+28=0

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

28a=-28

a=-28/28

a=-1

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