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Simplifying 20 = 13 + k Solving 20 = 13 + k 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. 20 + -1k = 13 + k + -1k Combine like terms: k + -1k = 0 20 + -1k = 13 + 0 20 + -1k = 13 Add '-20' to each side of the equation. 20 + -20 + -1k = 13 + -20 Combine like terms: 20 + -20 = 0 0 + -1k = 13 + -20 -1k = 13 + -20 Combine like terms: 13 + -20 = -7 -1k = -7 Divide each side by '-1'. k = 7 Simplifying k = 7
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