1 - 15 = -14
On the number line
...-15,-14 , =13 .... -2,-1- 0, 1,2,3, ...
Remember
For subtraction move to the left, and for addi
So if you star at '1' and move '15' places to the left (subtraction) you end up on '14'.
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2/3 = 10/15 and 1/5 = 3/15. 10/15 - 3/15 = 7/15 There's the answer
2/3 minus 6/10 = 1/15
7/10 minus 1/6 is 8/15
15y-15=0,y=1
1/3 -15 = -14.6666 .... recurring