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