(-2√5 + 10) - (-2√5 - 4) = -2√5 + 10 + 2√5 + 4 = 0 + 14 = 14
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(-2√5 + 10) - (-2√5 - 4) = -2√5 + 10 + 2√5 + 4 = 0 + 14 = 14