7=-13+a

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Solution for 7=-13+a equation: 



7=-13+a

We move all terms to the left:

7-(-13+a)=0

We add all the numbers together, and all the variables

-(a-13)+7=0

We get rid of parentheses

-a+13+7=0

We add all the numbers together, and all the variables

-1a+20=0

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

-a=-20

a=-20/-1

a=+20

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