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Simplifying (4x2 + -7xy + 9y2 + -13) + -1(-11x2 + -9xy + 3y2 + 18) = 0 Reorder the terms: (-13 + -7xy + 4x2 + 9y2) + -1(-11x2 + -9xy + 3y2 + 18) = 0 Remove parenthesis around (-13 + -7xy + 4x2 + 9y2) -13 + -7xy + 4x2 + 9y2 + -1(-11x2 + -9xy + 3y2 + 18) = 0 Reorder the terms: -13 + -7xy + 4x2 + 9y2 + -1(18 + -9xy + -11x2 + 3y2) = 0 -13 + -7xy + 4x2 + 9y2 + (18 * -1 + -9xy * -1 + -11x2 * -1 + 3y2 * -1) = 0 -13 + -7xy + 4x2 + 9y2 + (-18 + 9xy + 11x2 + -3y2) = 0 Reorder the terms: -13 + -18 + -7xy + 9xy + 4x2 + 11x2 + 9y2 + -3y2 = 0 Combine like terms: -13 + -18 = -31 -31 + -7xy + 9xy + 4x2 + 11x2 + 9y2 + -3y2 = 0 Combine like terms: -7xy + 9xy = 2xy -31 + 2xy + 4x2 + 11x2 + 9y2 + -3y2 = 0 Combine like terms: 4x2 + 11x2 = 15x2 -31 + 2xy + 15x2 + 9y2 + -3y2 = 0 Combine like terms: 9y2 + -3y2 = 6y2 -31 + 2xy + 15x2 + 6y2 = 0 Solving -31 + 2xy + 15x2 + 6y2 = 0 Solving for variable 'x'. The solution to this equation could not be determined.
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