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solve 2*4 + 3*(-5) = 2x + 3y , 1/2 * 2*4^2 + 1/2 * 3*(-5)^2 = 1/2 * 2*x^2 + 1/2 * 3*y^2
solve 2*4 + 3*(-5) = 2x + 3y , 1/2 * 2*4^2 + 1/2 * 3*(-5)^2 = 1/2 * 2*x^2 + 1/2 * 3*y^2
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