maybe eight
21 - 5 = 16 = 2 x 8
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-26
5 + 2 + 3 + 7 + (21/7) = 20
7 + 5 + 4 ÷ 2 + 7 = 21
X^2 + 5 = 21 subtract 5 from each side X^2 = 16 take square root each side X = (+/-) 4 -------------------------easy to check
Absolute value of -2+(-5) is 7.