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Simplifying 21d + 13 + -19d = 27 Reorder the terms: 13 + 21d + -19d = 27 Combine like terms: 21d + -19d = 2d 13 + 2d = 27 Solving 13 + 2d = 27 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 2d = 27 + -13 Combine like terms: 13 + -13 = 0 0 + 2d = 27 + -13 2d = 27 + -13 Combine like terms: 27 + -13 = 14 2d = 14 Divide each side by '2'. d = 7 Simplifying d = 7
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