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Simplifying 30 = k + -1(-9) Multiply -1 * -9 30 = k + 9 Reorder the terms: 30 = 9 + k Solving 30 = 9 + 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. 30 + -1k = 9 + k + -1k Combine like terms: k + -1k = 0 30 + -1k = 9 + 0 30 + -1k = 9 Add '-30' to each side of the equation. 30 + -30 + -1k = 9 + -30 Combine like terms: 30 + -30 = 0 0 + -1k = 9 + -30 -1k = 9 + -30 Combine like terms: 9 + -30 = -21 -1k = -21 Divide each side by '-1'. k = 21 Simplifying k = 21
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