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Simplifying x2 + 42x + c = 0 Reorder the terms: c + 42x + x2 = 0 Solving c + 42x + x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-42x' to each side of the equation. c + 42x + -42x + x2 = 0 + -42x Combine like terms: 42x + -42x = 0 c + 0 + x2 = 0 + -42x c + x2 = 0 + -42x Remove the zero: c + x2 = -42x Add '-1x2' to each side of the equation. c + x2 + -1x2 = -42x + -1x2 Combine like terms: x2 + -1x2 = 0 c + 0 = -42x + -1x2 c = -42x + -1x2 Simplifying c = -42x + -1x2
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