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Simplifying 28 = 2d + 20 Reorder the terms: 28 = 20 + 2d Solving 28 = 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. 28 + -2d = 20 + 2d + -2d Combine like terms: 2d + -2d = 0 28 + -2d = 20 + 0 28 + -2d = 20 Add '-28' to each side of the equation. 28 + -28 + -2d = 20 + -28 Combine like terms: 28 + -28 = 0 0 + -2d = 20 + -28 -2d = 20 + -28 Combine like terms: 20 + -28 = -8 -2d = -8 Divide each side by '-2'. d = 4 Simplifying d = 4
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