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Simplifying 3 = 3(d + 7) + -6d Reorder the terms: 3 = 3(7 + d) + -6d 3 = (7 * 3 + d * 3) + -6d 3 = (21 + 3d) + -6d Combine like terms: 3d + -6d = -3d 3 = 21 + -3d Solving 3 = 21 + -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 = 21 + -3d + 3d Combine like terms: -3d + 3d = 0 3 + 3d = 21 + 0 3 + 3d = 21 Add '-3' to each side of the equation. 3 + -3 + 3d = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 3d = 21 + -3 3d = 21 + -3 Combine like terms: 21 + -3 = 18 3d = 18 Divide each side by '3'. d = 6 Simplifying d = 6
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