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8.9.13.5-m+8.9=13.5
We move all terms to the left:
8.9.13.5-m+8.9-(13.5)=0
We add all the numbers together, and all the variables
-1m-4.0215=0
We move all terms containing m to the left, all other terms to the right
-m=4.0215
m=4.0215/-1
m=-4+0.0215/1
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