Expressed as a proper fraction in its simplest form, 5/9 - 2/18 = 4/9 or four ninths.
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2 minus 2/5 plus 1/2 minus 4 = -1.9
Unfortunately, 2 over 2 minus 1 equals 5 over 6 is just a wrong answer! If it is 2 over 2, minus 1, the answer is that it equals zero. If it is 2, over 2 minus 1, the answer is that it equals 2.
2/5 minus 1/15 is 1/3
1/2 minus 5/32 is 11/32
7/11 minus 2/5 is 13/55