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Simplifying 20 + -1(2d + -2) = 40 Reorder the terms: 20 + -1(-2 + 2d) = 40 20 + (-2 * -1 + 2d * -1) = 40 20 + (2 + -2d) = 40 Combine like terms: 20 + 2 = 22 22 + -2d = 40 Solving 22 + -2d = 40 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + -2d = 40 + -22 Combine like terms: 22 + -22 = 0 0 + -2d = 40 + -22 -2d = 40 + -22 Combine like terms: 40 + -22 = 18 -2d = 18 Divide each side by '-2'. d = -9 Simplifying d = -9
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