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Simplifying 3d + -21 = -3d + 3 Reorder the terms: -21 + 3d = -3d + 3 Reorder the terms: -21 + 3d = 3 + -3d Solving -21 + 3d = 3 + -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 = 3 + -3d + 3d Combine like terms: 3d + 3d = 6d -21 + 6d = 3 + -3d + 3d Combine like terms: -3d + 3d = 0 -21 + 6d = 3 + 0 -21 + 6d = 3 Add '21' to each side of the equation. -21 + 21 + 6d = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 6d = 3 + 21 6d = 3 + 21 Combine like terms: 3 + 21 = 24 6d = 24 Divide each side by '6'. d = 4 Simplifying d = 4
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