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Simplifying (21 + 12k) = 19k Remove parenthesis around (21 + 12k) 21 + 12k = 19k Solving 21 + 12k = 19k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-19k' to each side of the equation. 21 + 12k + -19k = 19k + -19k Combine like terms: 12k + -19k = -7k 21 + -7k = 19k + -19k Combine like terms: 19k + -19k = 0 21 + -7k = 0 Add '-21' to each side of the equation. 21 + -21 + -7k = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7k = 0 + -21 -7k = 0 + -21 Combine like terms: 0 + -21 = -21 -7k = -21 Divide each side by '-7'. k = 3 Simplifying k = 3
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