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Simplifying 5(d + 2) + -9 = 21 Reorder the terms: 5(2 + d) + -9 = 21 (2 * 5 + d * 5) + -9 = 21 (10 + 5d) + -9 = 21 Reorder the terms: 10 + -9 + 5d = 21 Combine like terms: 10 + -9 = 1 1 + 5d = 21 Solving 1 + 5d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 5d = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 5d = 21 + -1 5d = 21 + -1 Combine like terms: 21 + -1 = 20 5d = 20 Divide each side by '5'. d = 4 Simplifying d = 4
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