2/5=640/m

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Solution for 2/5=640/m equation: 



2/5=640/m

We move all terms to the left:

2/5-(640/m)=0



Domain of the equation: m)!=0

m!=0/1

m!=0

m∈R



We add all the numbers together, and all the variables

-(+640/m)+2/5=0

We get rid of parentheses

-640/m+2/5=0

We calculate fractions

There is no solution for this equation

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