There are an infinite amount of answers to that, like:
21 - 3 = 18
1004 - 986 = 18
47 - 29 = 18
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-18 minus 9 is -27
18 – 45 = –27
X - 7 = 11 X = 11+7 therefore X = 18 18 minus 7 equals 11.
3 + 3 = 6 6 x 3 = 18 18 - 3 = 15 15 + 3 = 18
If a equals 3 and b equals minus 5 then a minus b equals what