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Simplifying 21 = -3(6d + 7) Reorder the terms: 21 = -3(7 + 6d) 21 = (7 * -3 + 6d * -3) 21 = (-21 + -18d) Solving 21 = -21 + -18d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '18d' to each side of the equation. 21 + 18d = -21 + -18d + 18d Combine like terms: -18d + 18d = 0 21 + 18d = -21 + 0 21 + 18d = -21 Add '-21' to each side of the equation. 21 + -21 + 18d = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 18d = -21 + -21 18d = -21 + -21 Combine like terms: -21 + -21 = -42 18d = -42 Divide each side by '18'. d = -2.333333333 Simplifying d = -2.333333333
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