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Simplifying 25 = d + d Combine like terms: d + d = 2d 25 = 2d Solving 25 = 2d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2d' to each side of the equation. 25 + -2d = 2d + -2d Combine like terms: 2d + -2d = 0 25 + -2d = 0 Add '-25' to each side of the equation. 25 + -25 + -2d = 0 + -25 Combine like terms: 25 + -25 = 0 0 + -2d = 0 + -25 -2d = 0 + -25 Combine like terms: 0 + -25 = -25 -2d = -25 Divide each side by '-2'. d = 12.5 Simplifying d = 12.5
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