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Simplifying 28k + 30(7 + k) = 0 28k + (7 * 30 + k * 30) = 0 28k + (210 + 30k) = 0 Reorder the terms: 210 + 28k + 30k = 0 Combine like terms: 28k + 30k = 58k 210 + 58k = 0 Solving 210 + 58k = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-210' to each side of the equation. 210 + -210 + 58k = 0 + -210 Combine like terms: 210 + -210 = 0 0 + 58k = 0 + -210 58k = 0 + -210 Combine like terms: 0 + -210 = -210 58k = -210 Divide each side by '58'. k = -3.620689655 Simplifying k = -3.620689655
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