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Simplifying 21 = -3d Solving 21 = -3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '3d' to each side of the equation. 21 + 3d = -3d + 3d Combine like terms: -3d + 3d = 0 21 + 3d = 0 Add '-21' to each side of the equation. 21 + -21 + 3d = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3d = 0 + -21 3d = 0 + -21 Combine like terms: 0 + -21 = -21 3d = -21 Divide each side by '3'. d = -7 Simplifying d = -7
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