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Simplifying 3d + -9 = d + 7 Reorder the terms: -9 + 3d = d + 7 Reorder the terms: -9 + 3d = 7 + d Solving -9 + 3d = 7 + 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 + 3d + -1d = 7 + d + -1d Combine like terms: 3d + -1d = 2d -9 + 2d = 7 + d + -1d Combine like terms: d + -1d = 0 -9 + 2d = 7 + 0 -9 + 2d = 7 Add '9' to each side of the equation. -9 + 9 + 2d = 7 + 9 Combine like terms: -9 + 9 = 0 0 + 2d = 7 + 9 2d = 7 + 9 Combine like terms: 7 + 9 = 16 2d = 16 Divide each side by '2'. d = 8 Simplifying d = 8
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