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9/m=20
We move all terms to the left:
9/m-(20)=0
Domain of the equation: m!=0We multiply all the terms by the denominator
m∈R
-20*m+9=0
We add all the numbers together, and all the variables
-20m+9=0
We move all terms containing m to the left, all other terms to the right
-20m=-9
m=-9/-20
m=9/20
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