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