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2015-06-02T19:03:14+08:00

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We have
18 - _ = 5+6
18 - _ = 11
So we know now that the answer is 7 because:
18 - 11 - _ = 11 - 11 [We subtract 11 from both sides by APE]
7 - _ = 0
7 = _
0
2015-06-03T19:05:34+08:00

18-(5+6)=7 because 18 minus the sum of 5 and 6 so the sum of 5 and 6 is 11 and 18-11 is 7
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