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Simplifying 3 = 15 + -3d Solving 3 = 15 + -3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '3d' to each side of the equation. 3 + 3d = 15 + -3d + 3d Combine like terms: -3d + 3d = 0 3 + 3d = 15 + 0 3 + 3d = 15 Add '-3' to each side of the equation. 3 + -3 + 3d = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 3d = 15 + -3 3d = 15 + -3 Combine like terms: 15 + -3 = 12 3d = 12 Divide each side by '3'. d = 4 Simplifying d = 4
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