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Simplifying 3d + 7 + -9 = 21 Reorder the terms: 7 + -9 + 3d = 21 Combine like terms: 7 + -9 = -2 -2 + 3d = 21 Solving -2 + 3d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 3d = 21 + 2 Combine like terms: -2 + 2 = 0 0 + 3d = 21 + 2 3d = 21 + 2 Combine like terms: 21 + 2 = 23 3d = 23 Divide each side by '3'. d = 7.666666667 Simplifying d = 7.666666667
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