SOLUTION: what should be added to both sides of this equation to solve for the variable? m+(-9)=12

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Question 700976: what should be added to both sides of this equation to solve for the variable?
m+(-9)=12
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
m+(-9)=12 ADD 9.
m-9+9=12+9
m=21 ans.