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Simplifying 21 = -2d + 7 Reorder the terms: 21 = 7 + -2d Solving 21 = 7 + -2d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2d' to each side of the equation. 21 + 2d = 7 + -2d + 2d Combine like terms: -2d + 2d = 0 21 + 2d = 7 + 0 21 + 2d = 7 Add '-21' to each side of the equation. 21 + -21 + 2d = 7 + -21 Combine like terms: 21 + -21 = 0 0 + 2d = 7 + -21 2d = 7 + -21 Combine like terms: 7 + -21 = -14 2d = -14 Divide each side by '2'. d = -7 Simplifying d = -7
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