Question 674892
-n + 2 = 20
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{{{cross(-n) + 2 + cross(n) = 20 + highlight(n)}}}
2 = 20 + n
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{{{2 - highlight(20) = cross(20) + n - cross(20)}}}
2 - 20 = n
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n = -18
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CHECK
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-({{{highlight(-18)}}}) + 2 = 18 + 2 = 20

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