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Simplifying 89 = 0.9d + 71 Reorder the terms: 89 = 71 + 0.9d Solving 89 = 71 + 0.9d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.9d' to each side of the equation. 89 + -0.9d = 71 + 0.9d + -0.9d Combine like terms: 0.9d + -0.9d = 0.0 89 + -0.9d = 71 + 0.0 89 + -0.9d = 71 Add '-89' to each side of the equation. 89 + -89 + -0.9d = 71 + -89 Combine like terms: 89 + -89 = 0 0 + -0.9d = 71 + -89 -0.9d = 71 + -89 Combine like terms: 71 + -89 = -18 -0.9d = -18 Divide each side by '-0.9'. d = 20 Simplifying d = 20
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