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Simplifying -13d + 21 = 8d Reorder the terms: 21 + -13d = 8d Solving 21 + -13d = 8d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-8d' to each side of the equation. 21 + -13d + -8d = 8d + -8d Combine like terms: -13d + -8d = -21d 21 + -21d = 8d + -8d Combine like terms: 8d + -8d = 0 21 + -21d = 0 Add '-21' to each side of the equation. 21 + -21 + -21d = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -21d = 0 + -21 -21d = 0 + -21 Combine like terms: 0 + -21 = -21 -21d = -21 Divide each side by '-21'. d = 1 Simplifying d = 1
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