Question 577569
-4/7-(-3/4)



-4/7+3/4



(-4/7)*(4/4)+3/4



-16/28+3/4



-16/28+(3/4)*(7/7)



-16/28+21/28



(-16+21)/28



5/28




So -4/7-(-3/4) = 5/28