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