Answer :

naǫ
[tex]m(3-4m)=7+4(8-m^2) \\ 3m-4m^2=7+32-4m^2 \\ 3m-4m^2+4m^2=7+32 \\ 3m=39 \\ m=\frac{39}{3} \\ m=13[/tex]

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