-55=-13-7a

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Solution for -55=-13-7a equation: 



-55=-13-7a

We move all terms to the left:

-55-(-13-7a)=0

We add all the numbers together, and all the variables

-(-7a-13)-55=0

We get rid of parentheses

7a+13-55=0

We add all the numbers together, and all the variables

7a-42=0

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

7a=42

a=42/7

a=6

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