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Simplifying 3(3k + -21) = 63 Reorder the terms: 3(-21 + 3k) = 63 (-21 * 3 + 3k * 3) = 63 (-63 + 9k) = 63 Solving -63 + 9k = 63 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 9k = 63 + 63 Combine like terms: -63 + 63 = 0 0 + 9k = 63 + 63 9k = 63 + 63 Combine like terms: 63 + 63 = 126 9k = 126 Divide each side by '9'. k = 14 Simplifying k = 14
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