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Simplifying 3 + k = 21 + 3k Solving 3 + k = 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. 3 + k + -3k = 21 + 3k + -3k Combine like terms: k + -3k = -2k 3 + -2k = 21 + 3k + -3k Combine like terms: 3k + -3k = 0 3 + -2k = 21 + 0 3 + -2k = 21 Add '-3' to each side of the equation. 3 + -3 + -2k = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -2k = 21 + -3 -2k = 21 + -3 Combine like terms: 21 + -3 = 18 -2k = 18 Divide each side by '-2'. k = -9 Simplifying k = -9
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