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Simplifying 20 + -1d = -4 + -3d Solving 20 + -1d = -4 + -3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '3d' to each side of the equation. 20 + -1d + 3d = -4 + -3d + 3d Combine like terms: -1d + 3d = 2d 20 + 2d = -4 + -3d + 3d Combine like terms: -3d + 3d = 0 20 + 2d = -4 + 0 20 + 2d = -4 Add '-20' to each side of the equation. 20 + -20 + 2d = -4 + -20 Combine like terms: 20 + -20 = 0 0 + 2d = -4 + -20 2d = -4 + -20 Combine like terms: -4 + -20 = -24 2d = -24 Divide each side by '2'. d = -12 Simplifying d = -12
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