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Simplifying 10 + -7d = 20 + -9d Solving 10 + -7d = 20 + -9d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '9d' to each side of the equation. 10 + -7d + 9d = 20 + -9d + 9d Combine like terms: -7d + 9d = 2d 10 + 2d = 20 + -9d + 9d Combine like terms: -9d + 9d = 0 10 + 2d = 20 + 0 10 + 2d = 20 Add '-10' to each side of the equation. 10 + -10 + 2d = 20 + -10 Combine like terms: 10 + -10 = 0 0 + 2d = 20 + -10 2d = 20 + -10 Combine like terms: 20 + -10 = 10 2d = 10 Divide each side by '2'. d = 5 Simplifying d = 5
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