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m/21=-6.8
We move all terms to the left:
m/21-(-6.8)=0
We add all the numbers together, and all the variables
m/21+6.8=0
We multiply all the terms by the denominator
m+(6.8)*21=0
We add all the numbers together, and all the variables
m+142.8=0
We move all terms containing m to the left, all other terms to the right
m=-142.8
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