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Simplifying 3k + 21 + -6k = 25 + 3 Reorder the terms: 21 + 3k + -6k = 25 + 3 Combine like terms: 3k + -6k = -3k 21 + -3k = 25 + 3 Combine like terms: 25 + 3 = 28 21 + -3k = 28 Solving 21 + -3k = 28 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3k = 28 + -21 Combine like terms: 21 + -21 = 0 0 + -3k = 28 + -21 -3k = 28 + -21 Combine like terms: 28 + -21 = 7 -3k = 7 Divide each side by '-3'. k = -2.333333333 Simplifying k = -2.333333333
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