-20+30=a+(-20)

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Solution for -20+30=a+(-20) equation: 



-20+30=a+(-20)

We move all terms to the left:

-20+30-(a+(-20))=0

We add all the numbers together, and all the variables

-(a+(-20))+10=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+10=0

We add all the numbers together, and all the variables

-1a+30=0

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

-a=-30

a=-30/-1

a=+30

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