1/3mm=21

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Solution for 1/3mm=21 equation: 



1/3mm=21

We move all terms to the left:

1/3mm-(21)=0



Domain of the equation: 3mm!=0

m!=0/1

m!=0

m∈R



We multiply all the terms by the denominator


-21*3mm+1=0

Wy multiply elements

-63m+1=0

We move all terms containing m to the left, all other terms to the right

-63m=-1

m=-1/-63

m=1/63

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