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Simplifying 31 = -2d + 7 Reorder the terms: 31 = 7 + -2d Solving 31 = 7 + -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. 31 + 2d = 7 + -2d + 2d Combine like terms: -2d + 2d = 0 31 + 2d = 7 + 0 31 + 2d = 7 Add '-31' to each side of the equation. 31 + -31 + 2d = 7 + -31 Combine like terms: 31 + -31 = 0 0 + 2d = 7 + -31 2d = 7 + -31 Combine like terms: 7 + -31 = -24 2d = -24 Divide each side by '2'. d = -12 Simplifying d = -12
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