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Simplifying 7(8 + -4d) = -21 (8 * 7 + -4d * 7) = -21 (56 + -28d) = -21 Solving 56 + -28d = -21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-56' to each side of the equation. 56 + -56 + -28d = -21 + -56 Combine like terms: 56 + -56 = 0 0 + -28d = -21 + -56 -28d = -21 + -56 Combine like terms: -21 + -56 = -77 -28d = -77 Divide each side by '-28'. d = 2.75 Simplifying d = 2.75
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