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Simplifying 13 + 7d = 8d Solving 13 + 7d = 8d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-8d' to each side of the equation. 13 + 7d + -8d = 8d + -8d Combine like terms: 7d + -8d = -1d 13 + -1d = 8d + -8d Combine like terms: 8d + -8d = 0 13 + -1d = 0 Add '-13' to each side of the equation. 13 + -13 + -1d = 0 + -13 Combine like terms: 13 + -13 = 0 0 + -1d = 0 + -13 -1d = 0 + -13 Combine like terms: 0 + -13 = -13 -1d = -13 Divide each side by '-1'. d = 13 Simplifying d = 13
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