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Simplifying -3(1 + 7d) = 33 (1 * -3 + 7d * -3) = 33 (-3 + -21d) = 33 Solving -3 + -21d = 33 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -21d = 33 + 3 Combine like terms: -3 + 3 = 0 0 + -21d = 33 + 3 -21d = 33 + 3 Combine like terms: 33 + 3 = 36 -21d = 36 Divide each side by '-21'. d = -1.714285714 Simplifying d = -1.714285714
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