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Simplifying 20 = 4(d + 3) Reorder the terms: 20 = 4(3 + d) 20 = (3 * 4 + d * 4) 20 = (12 + 4d) Solving 20 = 12 + 4d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-4d' to each side of the equation. 20 + -4d = 12 + 4d + -4d Combine like terms: 4d + -4d = 0 20 + -4d = 12 + 0 20 + -4d = 12 Add '-20' to each side of the equation. 20 + -20 + -4d = 12 + -20 Combine like terms: 20 + -20 = 0 0 + -4d = 12 + -20 -4d = 12 + -20 Combine like terms: 12 + -20 = -8 -4d = -8 Divide each side by '-4'. d = 2 Simplifying d = 2
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