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Simplifying 28 = 4(1 + 3d) 28 = (1 * 4 + 3d * 4) 28 = (4 + 12d) Solving 28 = 4 + 12d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-12d' to each side of the equation. 28 + -12d = 4 + 12d + -12d Combine like terms: 12d + -12d = 0 28 + -12d = 4 + 0 28 + -12d = 4 Add '-28' to each side of the equation. 28 + -28 + -12d = 4 + -28 Combine like terms: 28 + -28 = 0 0 + -12d = 4 + -28 -12d = 4 + -28 Combine like terms: 4 + -28 = -24 -12d = -24 Divide each side by '-12'. d = 2 Simplifying d = 2
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