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Simplifying 4d + 7 + -1d = 21 Reorder the terms: 7 + 4d + -1d = 21 Combine like terms: 4d + -1d = 3d 7 + 3d = 21 Solving 7 + 3d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 3d = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 3d = 21 + -7 3d = 21 + -7 Combine like terms: 21 + -7 = 14 3d = 14 Divide each side by '3'. d = 4.666666667 Simplifying d = 4.666666667
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