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Simplifying x2 + 9x + c + c = 0 Reorder the terms: c + c + 9x + x2 = 0 Combine like terms: c + c = 2c 2c + 9x + x2 = 0 Solving 2c + 9x + x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-9x' to each side of the equation. 2c + 9x + -9x + x2 = 0 + -9x Combine like terms: 9x + -9x = 0 2c + 0 + x2 = 0 + -9x 2c + x2 = 0 + -9x Remove the zero: 2c + x2 = -9x Add '-1x2' to each side of the equation. 2c + x2 + -1x2 = -9x + -1x2 Combine like terms: x2 + -1x2 = 0 2c + 0 = -9x + -1x2 2c = -9x + -1x2 Divide each side by '2'. c = -4.5x + -0.5x2 Simplifying c = -4.5x + -0.5x2
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