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Simplifying 15 + -2k = 21 Solving 15 + -2k = 21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -2k = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -2k = 21 + -15 -2k = 21 + -15 Combine like terms: 21 + -15 = 6 -2k = 6 Divide each side by '-2'. k = -3 Simplifying k = -3
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