10-13=-3
4/7-2/7=2/7
15-15=0
1-1,5=-0,5
7-8=1
10,99-10=0,99
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10-13=-3
4/7-2/7=2/7
15-15=0
1-1,5=-0,5
7-8=1
10,99-10=0,99