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0.7m-2-0.8m=-13
We move all terms to the left:
0.7m-2-0.8m-(-13)=0
We add all the numbers together, and all the variables
-0.1m+11=0
We move all terms containing m to the left, all other terms to the right
-0.1m=-11
m=-11/-0.1
m=+110
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