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Simplifying 2d + 30 = d + 12 Reorder the terms: 30 + 2d = d + 12 Reorder the terms: 30 + 2d = 12 + d Solving 30 + 2d = 12 + 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. 30 + 2d + -1d = 12 + d + -1d Combine like terms: 2d + -1d = 1d 30 + 1d = 12 + d + -1d Combine like terms: d + -1d = 0 30 + 1d = 12 + 0 30 + 1d = 12 Add '-30' to each side of the equation. 30 + -30 + 1d = 12 + -30 Combine like terms: 30 + -30 = 0 0 + 1d = 12 + -30 1d = 12 + -30 Combine like terms: 12 + -30 = -18 1d = -18 Divide each side by '1'. d = -18 Simplifying d = -18
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