To add and subtract using reversibility.
This week I had learnt how to do reversibility,
First, you have to reverse the equation e.g if the equation is 165 - 59 you change it to 59 + __ = 165.
Then you add to the first number to make it a even number.
After that you add to that number to get to 160, add the leftover 5 and add all the numbers that you added together.
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