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Simplifying 7 = k + 18 + -15 Reorder the terms: 7 = 18 + -15 + k Combine like terms: 18 + -15 = 3 7 = 3 + k Solving 7 = 3 + 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 = 3 + k + -1k Combine like terms: k + -1k = 0 7 + -1k = 3 + 0 7 + -1k = 3 Add '-7' to each side of the equation. 7 + -7 + -1k = 3 + -7 Combine like terms: 7 + -7 = 0 0 + -1k = 3 + -7 -1k = 3 + -7 Combine like terms: 3 + -7 = -4 -1k = -4 Divide each side by '-1'. k = 4 Simplifying k = 4
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