[6a^(m+5)*b^m]/(-2a*b^n)=-3a^7*b
-3a^(m+5-1)*b^(m-n)=-3a^7*b
-3a^(m+4)*b^(m-n)=-3a^7*b
m+4=7,m-n=1
m=3
n=2
m^-n
=3^-2
=(1/3)^2
=1/9
[6a^(m+5)*b^m]/(-2a*b^n)=-3a^7*b
-3a^(m+5-1)*b^(m-n)=-3a^7*b
-3a^(m+4)*b^(m-n)=-3a^7*b
m+4=7,m-n=1
m=3
n=2
m^-n
=3^-2
=(1/3)^2
=1/9