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Simplifying x2 + 28x + c = 0 Reorder the terms: c + 28x + x2 = 0 Solving c + 28x + x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-28x' to each side of the equation. c + 28x + -28x + x2 = 0 + -28x Combine like terms: 28x + -28x = 0 c + 0 + x2 = 0 + -28x c + x2 = 0 + -28x Remove the zero: c + x2 = -28x Add '-1x2' to each side of the equation. c + x2 + -1x2 = -28x + -1x2 Combine like terms: x2 + -1x2 = 0 c + 0 = -28x + -1x2 c = -28x + -1x2 Simplifying c = -28x + -1x2
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