= 5С^2 + 5С - B^2 + 9C^2 = 14C^2 - B^2 + 5C
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= 4A^2 + 4A + 1 + 1 - 4A^2 = 4A + 2
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= - 2 * ( X^2 - 4) = - 2X^2 + 8
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