#### Answer

$-7$

#### Work Step by Step

Multiply the coefficients : $-7$ X $m^{3}$ X $m^{-3}$
This becomes : $-7$ X $m^{3-3}$
(since the exponents are added while multiplying with the same base)
This becomes : $-7$ X $m^{0}$ = $-7$ X $1$
Final result : $-7$