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Simplifying 21d + 18 = 2.1(d + 8) Reorder the terms: 18 + 21d = 2.1(d + 8) Reorder the terms: 18 + 21d = 2.1(8 + d) 18 + 21d = (8 * 2.1 + d * 2.1) 18 + 21d = (16.8 + 2.1d) Solving 18 + 21d = 16.8 + 2.1d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2.1d' to each side of the equation. 18 + 21d + -2.1d = 16.8 + 2.1d + -2.1d Combine like terms: 21d + -2.1d = 18.9d 18 + 18.9d = 16.8 + 2.1d + -2.1d Combine like terms: 2.1d + -2.1d = 0.0 18 + 18.9d = 16.8 + 0.0 18 + 18.9d = 16.8 Add '-18' to each side of the equation. 18 + -18 + 18.9d = 16.8 + -18 Combine like terms: 18 + -18 = 0 0 + 18.9d = 16.8 + -18 18.9d = 16.8 + -18 Combine like terms: 16.8 + -18 = -1.2 18.9d = -1.2 Divide each side by '18.9'. d = -0.06349206349 Simplifying d = -0.06349206349
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