20-(-a)=13

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Solution for 20-(-a)=13 equation: 



20-(-a)=13

We move all terms to the left:

20-(-a)-(13)=0

We add all the numbers together, and all the variables

-(-1a)+20-13=0

We add all the numbers together, and all the variables

-(-1a)+7=0

We get rid of parentheses

1a+7=0

We add all the numbers together, and all the variables

a+7=0

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

a=-7

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