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[tex]D = \frac{m}{v} \\ [/tex]
[tex] \frac{m}{v} = D \\ [/tex]
Multiply sides by v
[tex]v \times \frac{m}{v} = v \times D \\ [/tex]
[tex]m = D \times v[/tex]
[tex]m = Dv[/tex]
