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Simplifying 21 = -2d + 3d Combine like terms: -2d + 3d = 1d 21 = 1d Solving 21 = 1d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1d' to each side of the equation. 21 + -1d = 1d + -1d Combine like terms: 1d + -1d = 0 21 + -1d = 0 Add '-21' to each side of the equation. 21 + -21 + -1d = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1d = 0 + -21 -1d = 0 + -21 Combine like terms: 0 + -21 = -21 -1d = -21 Divide each side by '-1'. d = 21 Simplifying d = 21
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