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Dahlia Kemmer ∙
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20 minus 17 minus 3 minus 2 equals -2
9/20 minus 2/5 is 1/20.
18/20 minus 2/5 is 1/2.
20 - (8 x 2) = 4
Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.