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40.8+30.3-m=180
We move all terms to the left:
40.8+30.3-m-(180)=0
We add all the numbers together, and all the variables
-1m-108.9=0
We move all terms containing m to the left, all other terms to the right
-m=108.9
m=108.9/-1
m=-108+0.90000000000001/1
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