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Simplifying 21 = 7 + 3k + -7 Reorder the terms: 21 = 7 + -7 + 3k Combine like terms: 7 + -7 = 0 21 = 0 + 3k 21 = 3k Solving 21 = 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 = 3k + -3k Combine like terms: 3k + -3k = 0 21 + -3k = 0 Add '-21' to each side of the equation. 21 + -21 + -3k = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3k = 0 + -21 -3k = 0 + -21 Combine like terms: 0 + -21 = -21 -3k = -21 Divide each side by '-3'. k = 7 Simplifying k = 7
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