-21=-21-b

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Solution for -21=-21-b equation:



-21=-21-b
We move all terms to the left:
-21-(-21-b)=0
We add all the numbers together, and all the variables
-(-1b-21)-21=0
We get rid of parentheses
1b+21-21=0
We add all the numbers together, and all the variables
b=0

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