-15=4+13a

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Solution for -15=4+13a equation: 



-15=4+13a

We move all terms to the left:

-15-(4+13a)=0

We add all the numbers together, and all the variables

-(13a+4)-15=0

We get rid of parentheses

-13a-4-15=0

We add all the numbers together, and all the variables

-13a-19=0

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

-13a=19

a=19/-13

a=-1+6/13

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