-5 minus 4 is -9.
Minus a negative means you add: 10.3 - -5 = 10.3 + 5 = 15.3
8/9 minus 5/9 is 1/3
23
(-4)-(-5)+(-8) =-4+5-8 = -7
-5 + 9 = 4
5/9 minus 5/12 is 5/36.
31/20 minus 5/9 is 179/180
7/9 minus 2/9 is 5/9
-9 minus -4 is -5
5 x 6 - 9 - 4 = 17
9 - 4 = 5