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Simplifying D + -12 = 2D Reorder the terms: -12 + D = 2D Solving -12 + D = 2D Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '-2D' to each side of the equation. -12 + D + -2D = 2D + -2D Combine like terms: D + -2D = -1D -12 + -1D = 2D + -2D Combine like terms: 2D + -2D = 0 -12 + -1D = 0 Add '12' to each side of the equation. -12 + 12 + -1D = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -1D = 0 + 12 -1D = 0 + 12 Combine like terms: 0 + 12 = 12 -1D = 12 Divide each side by '-1'. D = -12 Simplifying D = -12
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