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21-14m=-21+7
We move all terms to the left:
21-14m-(-21+7)=0
We add all the numbers together, and all the variables
-14m+21-(-14)=0
We add all the numbers together, and all the variables
-14m+35=0
We move all terms containing m to the left, all other terms to the right
-14m=-35
m=-35/-14
m=2+1/2
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