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Simplifying 2d + 21 = 17(3) Reorder the terms: 21 + 2d = 17(3) Multiply 17 * 3 21 + 2d = 51 Solving 21 + 2d = 51 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 2d = 51 + -21 Combine like terms: 21 + -21 = 0 0 + 2d = 51 + -21 2d = 51 + -21 Combine like terms: 51 + -21 = 30 2d = 30 Divide each side by '2'. d = 15 Simplifying d = 15
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