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Simplifying -4d + 9 = -15 + 2d Reorder the terms: 9 + -4d = -15 + 2d Solving 9 + -4d = -15 + 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. 9 + -4d + -2d = -15 + 2d + -2d Combine like terms: -4d + -2d = -6d 9 + -6d = -15 + 2d + -2d Combine like terms: 2d + -2d = 0 9 + -6d = -15 + 0 9 + -6d = -15 Add '-9' to each side of the equation. 9 + -9 + -6d = -15 + -9 Combine like terms: 9 + -9 = 0 0 + -6d = -15 + -9 -6d = -15 + -9 Combine like terms: -15 + -9 = -24 -6d = -24 Divide each side by '-6'. d = 4 Simplifying d = 4
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