3a+7=13(a+-2)

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Solution for 3a+7=13(a+-2) equation: 



3a+7=13(a+-2)

We move all terms to the left:

3a+7-(13(a+-2))=0

We add all the numbers together, and all the variables

3a-(13(a-2))+7=0



We calculate terms in parentheses: -(13(a-2)), so:

13(a-2)

We multiply parentheses

13a-26

Back to the equation:

-(13a-26)



We get rid of parentheses

3a-13a+26+7=0

We add all the numbers together, and all the variables

-10a+33=0

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

-10a=-33

a=-33/-10

a=3+3/10

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