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Simplifying 7(9 + -1k) = 84 (9 * 7 + -1k * 7) = 84 (63 + -7k) = 84 Solving 63 + -7k = 84 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -7k = 84 + -63 Combine like terms: 63 + -63 = 0 0 + -7k = 84 + -63 -7k = 84 + -63 Combine like terms: 84 + -63 = 21 -7k = 21 Divide each side by '-7'. k = -3 Simplifying k = -3
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