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Simplifying -21 = -3d + 8d Combine like terms: -3d + 8d = 5d -21 = 5d Solving -21 = 5d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-5d' to each side of the equation. -21 + -5d = 5d + -5d Combine like terms: 5d + -5d = 0 -21 + -5d = 0 Add '21' to each side of the equation. -21 + 21 + -5d = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -5d = 0 + 21 -5d = 0 + 21 Combine like terms: 0 + 21 = 21 -5d = 21 Divide each side by '-5'. d = -4.2 Simplifying d = -4.2
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