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