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Simplifying 7(3d + -9) = 0 Reorder the terms: 7(-9 + 3d) = 0 (-9 * 7 + 3d * 7) = 0 (-63 + 21d) = 0 Solving -63 + 21d = 0 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 21d = 0 + 63 Combine like terms: -63 + 63 = 0 0 + 21d = 0 + 63 21d = 0 + 63 Combine like terms: 0 + 63 = 63 21d = 63 Divide each side by '21'. d = 3 Simplifying d = 3
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