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Simplifying 3 + -1(4d + 9) = 21 Reorder the terms: 3 + -1(9 + 4d) = 21 3 + (9 * -1 + 4d * -1) = 21 3 + (-9 + -4d) = 21 Combine like terms: 3 + -9 = -6 -6 + -4d = 21 Solving -6 + -4d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -4d = 21 + 6 Combine like terms: -6 + 6 = 0 0 + -4d = 21 + 6 -4d = 21 + 6 Combine like terms: 21 + 6 = 27 -4d = 27 Divide each side by '-4'. d = -6.75 Simplifying d = -6.75
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