Question 176942
Notice how the left side has the real part "20" and the imaginary part "-12"






Also, take note how the right side has the real part "5m" and the imaginary part "4n"


Now equate the real parts to get {{{20=5m}}}. Solving for "m", we get {{{20/5=m}}} ----> {{{m=4}}}



Equate the imaginary parts to get {{{-12=4n}}}. Solve for "n" to get {{{-12/4=n}}} ----> {{{n=-3}}}