21+-3m=-12

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Solution for 21+-3m=-12 equation:



21+-3m=-12
We move all terms to the left:
21+-3m-(-12)=0
We add all the numbers together, and all the variables
-3m+33=0
We move all terms containing m to the left, all other terms to the right
-3m=-33
m=-33/-3
m=+11

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