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There are no symbols between 5 and 13 or between 9 and 12.
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13/20 - 3/5 = 13/20 - 12/20 = 1/20
You can't. For example if your equation is: 2x+7=12 then you will subtract 7 by itself, then subtract 7 from 12. You then get 2x=5. You will then divide 5 by 2 and you will get x=2.5 as your final answer.
22
(12 to 12 - 3) x 5 - 9.5 If the "to" means add, that's 95.5
5/12 - 4/12 = 1/12