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Simplifying x2 + -4x + c = 0 Reorder the terms: c + -4x + x2 = 0 Solving c + -4x + x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4x' to each side of the equation. c + -4x + 4x + x2 = 0 + 4x Combine like terms: -4x + 4x = 0 c + 0 + x2 = 0 + 4x c + x2 = 0 + 4x Remove the zero: c + x2 = 4x Add '-1x2' to each side of the equation. c + x2 + -1x2 = 4x + -1x2 Combine like terms: x2 + -1x2 = 0 c + 0 = 4x + -1x2 c = 4x + -1x2 Simplifying c = 4x + -1x2
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