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Simplifying -7d + 7 = 21d Reorder the terms: 7 + -7d = 21d Solving 7 + -7d = 21d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-21d' to each side of the equation. 7 + -7d + -21d = 21d + -21d Combine like terms: -7d + -21d = -28d 7 + -28d = 21d + -21d Combine like terms: 21d + -21d = 0 7 + -28d = 0 Add '-7' to each side of the equation. 7 + -7 + -28d = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -28d = 0 + -7 -28d = 0 + -7 Combine like terms: 0 + -7 = -7 -28d = -7 Divide each side by '-28'. d = 0.25 Simplifying d = 0.25
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