It is 21 -9 = 12
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To do this, first we convert to twenty-eights. That gives us eight twenty-eights minus seven twenty-eights which equals one twenty-eight.
Twenty minus one.
in the number minus twenty three there are minus sixty nine thirds. In the number 2/3 there are two thirds.
One whole is nine ninths. Nine ninths minus four ninths equals five ninths.
My answer is nine and thirty one hundredths twenty one ten thousandths.