1=a-13(-6)

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Solution for 1=a-13(-6) equation: 



1=a-13(-6)

We move all terms to the left:

1-(a-13(-6))=0



We calculate terms in parentheses: -(a-13(-6)), so:

a-13(-6)

We add all the numbers together, and all the variables

a+78

Back to the equation:

-(a+78)



We get rid of parentheses

-a-78+1=0

We add all the numbers together, and all the variables

-1a-77=0

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

-a=77

a=77/-1

a=-77

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