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Simplifying 12 + 4d = 2d + -20 Reorder the terms: 12 + 4d = -20 + 2d Solving 12 + 4d = -20 + 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 + 4d + -2d = -20 + 2d + -2d Combine like terms: 4d + -2d = 2d 12 + 2d = -20 + 2d + -2d Combine like terms: 2d + -2d = 0 12 + 2d = -20 + 0 12 + 2d = -20 Add '-12' to each side of the equation. 12 + -12 + 2d = -20 + -12 Combine like terms: 12 + -12 = 0 0 + 2d = -20 + -12 2d = -20 + -12 Combine like terms: -20 + -12 = -32 2d = -32 Divide each side by '2'. d = -16 Simplifying d = -16
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