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Simplifying x2 + 7x + c = 0 Reorder the terms: c + 7x + x2 = 0 Solving c + 7x + x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-7x' to each side of the equation. c + 7x + -7x + x2 = 0 + -7x Combine like terms: 7x + -7x = 0 c + 0 + x2 = 0 + -7x c + x2 = 0 + -7x Remove the zero: c + x2 = -7x Add '-1x2' to each side of the equation. c + x2 + -1x2 = -7x + -1x2 Combine like terms: x2 + -1x2 = 0 c + 0 = -7x + -1x2 c = -7x + -1x2 Simplifying c = -7x + -1x2
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