(-18)+b=21

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



(-18)+b=21

We move all terms to the left:

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

determiningTheFunctionDomain
b-21+(-18)=0

We add all the numbers together, and all the variables

b-39=0

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

b=39

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