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Simplifying 3x2 + 6x + d = 0 Reorder the terms: d + 6x + 3x2 = 0 Solving d + 6x + 3x2 = 0 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-6x' to each side of the equation. d + 6x + -6x + 3x2 = 0 + -6x Combine like terms: 6x + -6x = 0 d + 0 + 3x2 = 0 + -6x d + 3x2 = 0 + -6x Remove the zero: d + 3x2 = -6x Add '-3x2' to each side of the equation. d + 3x2 + -3x2 = -6x + -3x2 Combine like terms: 3x2 + -3x2 = 0 d + 0 = -6x + -3x2 d = -6x + -3x2 Simplifying d = -6x + -3x2
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