18=a-(-20)

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Solution for 18=a-(-20) equation: 



18=a-(-20)

We move all terms to the left:

18-(a-(-20))=0



We calculate terms in parentheses: -(a-(-20)), so:

a-(-20)

We add all the numbers together, and all the variables

a+20

Back to the equation:

-(a+20)



We get rid of parentheses

-a-20+18=0

We add all the numbers together, and all the variables

-1a-2=0

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

-a=2

a=2/-1

a=-2

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