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Well, honey, if you want to subtract from 47 6 to make 7, you need to subtract 40. Technically speaking, 47 minus 40 equals 7. So, there you go, simple math for you.
210. basic math is your friend.
If you mean 8 and 7/12 subtract 2 and 3/8 then it is 6 and 5/24
-1,-2,+2,-4,+4,-5,+5, +0. the sequence is subtract twice, add once, subtract again, add, then subtract, then add twice.
8 1/6 - 2 5/6 = 5 1/3. Here's how I did it. Borrow a 1 from the 8 and change it to 6/6 & add to 1/6, so you have 7 and 7/6. Subtract 5/6 from 7/6 = 2/6, which equals 1/3. Subtract 2 from 7 = 5.