It depends on the interpretation of the question:
Trivially, (m/m)-4 = 1-4 = 1.
More interestingly,
m-a = 1/ma or ma = 1/m-a
So, m/m-4 = m*(1/m-4) = m*(m4) = m5
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(2m/4) - (m/4) = m/4
m^4 n^5 - m^20 n^21
m/(-4) = 9m = 9 x (-4)m = -36
m^4 x m^3 = m^7Using a numerical example, 2^4 x 2^3 = 16 x 8 = 128 = 2^7
5/6 - m/4 = 1/3. First isolate the variable m, start by adding m/4 to both sides. 5/6 = 1/3 + m/4. Then subtract 1/3 from each side. 5/6 - 1/3 = m/4. Next multiply both sides by 4. 4 ( 5/6 - 1/3 ) = m. Then solve for m. 4 ( 5/6 - 2/6 ) = m. 4 ( 3/6 ) = m 4 ( 1/2 ) = m 2 = m