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Simplifying -21 = 3(k + 3) Reorder the terms: -21 = 3(3 + k) -21 = (3 * 3 + k * 3) -21 = (9 + 3k) Solving -21 = 9 + 3k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-3k' to each side of the equation. -21 + -3k = 9 + 3k + -3k Combine like terms: 3k + -3k = 0 -21 + -3k = 9 + 0 -21 + -3k = 9 Add '21' to each side of the equation. -21 + 21 + -3k = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -3k = 9 + 21 -3k = 9 + 21 Combine like terms: 9 + 21 = 30 -3k = 30 Divide each side by '-3'. k = -10 Simplifying k = -10
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