-21=b+(-18)

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Solution for -21=b+(-18) equation: 



-21=b+(-18)

We move all terms to the left:

-21-(b+(-18))=0



We calculate terms in parentheses: -(b+(-18)), so:

b+(-18)

We add all the numbers together, and all the variables

b-18

Back to the equation:

-(b-18)



We get rid of parentheses

-b+18-21=0

We add all the numbers together, and all the variables

-1b-3=0

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

-b=3

b=3/-1

b=-3

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