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Simplifying 15d + -6d + -9d + 4d + -1d + -3 = 18 Reorder the terms: -3 + 15d + -6d + -9d + 4d + -1d = 18 Combine like terms: 15d + -6d = 9d -3 + 9d + -9d + 4d + -1d = 18 Combine like terms: 9d + -9d = 0 -3 + 0 + 4d + -1d = 18 -3 + 4d + -1d = 18 Combine like terms: 4d + -1d = 3d -3 + 3d = 18 Solving -3 + 3d = 18 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3d = 18 + 3 Combine like terms: -3 + 3 = 0 0 + 3d = 18 + 3 3d = 18 + 3 Combine like terms: 18 + 3 = 21 3d = 21 Divide each side by '3'. d = 7 Simplifying d = 7
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