For the addition and subtraction problems, you need to find the common denominators.
3/4 - 4/7= 21/28 - 16/28 = 5/28
I'm sure you can do the next two.
-5/6 * 2/5 = -10/30 = -1/3
3/4 - 4/7=
-2/5 - 3/4=
5//6 + 7/10=
-5/6 X 2/5=
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