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Simplifying 7(2d + -1) = 21 Reorder the terms: 7(-1 + 2d) = 21 (-1 * 7 + 2d * 7) = 21 (-7 + 14d) = 21 Solving -7 + 14d = 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 + 14d = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 14d = 21 + 7 14d = 21 + 7 Combine like terms: 21 + 7 = 28 14d = 28 Divide each side by '14'. d = 2 Simplifying d = 2
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