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Simplifying k + 21 + -14k = -21 Reorder the terms: 21 + k + -14k = -21 Combine like terms: k + -14k = -13k 21 + -13k = -21 Solving 21 + -13k = -21 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 + -13k = -21 + -21 Combine like terms: 21 + -21 = 0 0 + -13k = -21 + -21 -13k = -21 + -21 Combine like terms: -21 + -21 = -42 -13k = -42 Divide each side by '-13'. k = 3.230769231 Simplifying k = 3.230769231
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