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Simplifying 21 = 9 + 2(d + -3) Reorder the terms: 21 = 9 + 2(-3 + d) 21 = 9 + (-3 * 2 + d * 2) 21 = 9 + (-6 + 2d) Combine like terms: 9 + -6 = 3 21 = 3 + 2d Solving 21 = 3 + 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 = 3 + 2d + -2d Combine like terms: 2d + -2d = 0 21 + -2d = 3 + 0 21 + -2d = 3 Add '-21' to each side of the equation. 21 + -21 + -2d = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -2d = 3 + -21 -2d = 3 + -21 Combine like terms: 3 + -21 = -18 -2d = -18 Divide each side by '-2'. d = 9 Simplifying d = 9
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