12+3m=-9

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Solution for 12+3m=-9 equation:



12+3m=-9
We move all terms to the left:
12+3m-(-9)=0
We add all the numbers together, and all the variables
3m+21=0
We move all terms containing m to the left, all other terms to the right
3m=-21
m=-21/3
m=-7

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