Verified Answer :

To solve this equation we want to have only one variable m on the LHS.
m-4=2m          / +4     /we are adding 4 to both sides
m-4+4=2m+4
m=2m+4  /-2m   
-m=4               /\(*(-1)\)
m=-4

Illuminati750

Hello, 

m-4=2m
m-4-m=2m-m
-4=m

Answer: m= -4

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