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"6 + 9" is easy for me, but for some reason, I need some time to calculate "7 + 9"... Don't you have such combinations of numbers that feel a little more difficult for you? For me, the author of this app, the combinations containing 8 or 9 were difficult. I felt it also hard to calculate the total price of products every time I went shopping. So, I decided to develop this app, considering my own…
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