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Simplifying -7d + 9 = d + 9 Reorder the terms: 9 + -7d = d + 9 Reorder the terms: 9 + -7d = 9 + d Add '-9' to each side of the equation. 9 + -9 + -7d = 9 + -9 + d Combine like terms: 9 + -9 = 0 0 + -7d = 9 + -9 + d -7d = 9 + -9 + d Combine like terms: 9 + -9 = 0 -7d = 0 + d -7d = d Solving -7d = 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. -7d + -1d = d + -1d Combine like terms: -7d + -1d = -8d -8d = d + -1d Combine like terms: d + -1d = 0 -8d = 0 Divide each side by '-8'. d = 0 Simplifying d = 0
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