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Simplifying 9d + -21 = 7d + 5 Reorder the terms: -21 + 9d = 7d + 5 Reorder the terms: -21 + 9d = 5 + 7d Solving -21 + 9d = 5 + 7d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-7d' to each side of the equation. -21 + 9d + -7d = 5 + 7d + -7d Combine like terms: 9d + -7d = 2d -21 + 2d = 5 + 7d + -7d Combine like terms: 7d + -7d = 0 -21 + 2d = 5 + 0 -21 + 2d = 5 Add '21' to each side of the equation. -21 + 21 + 2d = 5 + 21 Combine like terms: -21 + 21 = 0 0 + 2d = 5 + 21 2d = 5 + 21 Combine like terms: 5 + 21 = 26 2d = 26 Divide each side by '2'. d = 13 Simplifying d = 13
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