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Simplifying 15 = -2(d + -1) Reorder the terms: 15 = -2(-1 + d) 15 = (-1 * -2 + d * -2) 15 = (2 + -2d) Solving 15 = 2 + -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. 15 + 2d = 2 + -2d + 2d Combine like terms: -2d + 2d = 0 15 + 2d = 2 + 0 15 + 2d = 2 Add '-15' to each side of the equation. 15 + -15 + 2d = 2 + -15 Combine like terms: 15 + -15 = 0 0 + 2d = 2 + -15 2d = 2 + -15 Combine like terms: 2 + -15 = -13 2d = -13 Divide each side by '2'. d = -6.5 Simplifying d = -6.5
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