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Simplifying (d2 + 18)(d + 4) = -9 Reorder the terms: (18 + d2)(d + 4) = -9 Reorder the terms: (18 + d2)(4 + d) = -9 Multiply (18 + d2) * (4 + d) (18(4 + d) + d2(4 + d)) = -9 ((4 * 18 + d * 18) + d2(4 + d)) = -9 ((72 + 18d) + d2(4 + d)) = -9 (72 + 18d + (4 * d2 + d * d2)) = -9 (72 + 18d + (4d2 + d3)) = -9 (72 + 18d + 4d2 + d3) = -9 Solving 72 + 18d + 4d2 + d3 = -9 Solving for variable 'd'. Reorder the terms: 72 + 9 + 18d + 4d2 + d3 = -9 + 9 Combine like terms: 72 + 9 = 81 81 + 18d + 4d2 + d3 = -9 + 9 Combine like terms: -9 + 9 = 0 81 + 18d + 4d2 + d3 = 0 The solution to this equation could not be determined.
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