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Simplifying 21 + 21 = 3x + k Combine like terms: 21 + 21 = 42 42 = 3x + k Reorder the terms: 42 = k + 3x Solving 42 = k + 3x Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-1k' to each side of the equation. 42 + -1k = k + -1k + 3x Combine like terms: k + -1k = 0 42 + -1k = 0 + 3x 42 + -1k = 3x Add '-42' to each side of the equation. 42 + -42 + -1k = -42 + 3x Combine like terms: 42 + -42 = 0 0 + -1k = -42 + 3x -1k = -42 + 3x Divide each side by '-1'. k = 42 + -3x Simplifying k = 42 + -3x
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