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Simplifying 6d + 8.7 = d + d Reorder the terms: 8.7 + 6d = d + d Combine like terms: d + d = 2d 8.7 + 6d = 2d Solving 8.7 + 6d = 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. 8.7 + 6d + -2d = 2d + -2d Combine like terms: 6d + -2d = 4d 8.7 + 4d = 2d + -2d Combine like terms: 2d + -2d = 0 8.7 + 4d = 0 Add '-8.7' to each side of the equation. 8.7 + -8.7 + 4d = 0 + -8.7 Combine like terms: 8.7 + -8.7 = 0.0 0.0 + 4d = 0 + -8.7 4d = 0 + -8.7 Combine like terms: 0 + -8.7 = -8.7 4d = -8.7 Divide each side by '4'. d = -2.175 Simplifying d = -2.175
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