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Simplifying 20d + 13 + -12 = -43 Reorder the terms: 13 + -12 + 20d = -43 Combine like terms: 13 + -12 = 1 1 + 20d = -43 Solving 1 + 20d = -43 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 20d = -43 + -1 Combine like terms: 1 + -1 = 0 0 + 20d = -43 + -1 20d = -43 + -1 Combine like terms: -43 + -1 = -44 20d = -44 Divide each side by '20'. d = -2.2 Simplifying d = -2.2
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