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Simplifying 21 + -1d = 13 Solving 21 + -1d = 13 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 + -1d = 13 + -21 Combine like terms: 21 + -21 = 0 0 + -1d = 13 + -21 -1d = 13 + -21 Combine like terms: 13 + -21 = -8 -1d = -8 Divide each side by '-1'. d = 8 Simplifying d = 8
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