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Simplifying d + (d + 1) = 131 Reorder the terms: d + (1 + d) = 131 Remove parenthesis around (1 + d) d + 1 + d = 131 Reorder the terms: 1 + d + d = 131 Combine like terms: d + d = 2d 1 + 2d = 131 Solving 1 + 2d = 131 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 + 2d = 131 + -1 Combine like terms: 1 + -1 = 0 0 + 2d = 131 + -1 2d = 131 + -1 Combine like terms: 131 + -1 = 130 2d = 130 Divide each side by '2'. d = 65 Simplifying d = 65
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