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b. 5/m + 4/(m^2)
= (5*m+4)/m^2
= 5m+4 / m^2
c.x/3 - 2x/5
= (x*5)-(3*2x) / 15
= -x/15
d. 5/2x - 3/4x
=((5*2x)-3)/4
=10x-3 /4