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Simplifying 80 = 2(3.14)(4) * k Multiply 2 * 3.14 80 = 6.28 * 4k Multiply 6.28 * 4 80 = 25.12k Solving 80 = 25.12k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-25.12k' to each side of the equation. 80 + -25.12k = 25.12k + -25.12k Combine like terms: 25.12k + -25.12k = 0.00 80 + -25.12k = 0.00 Add '-80' to each side of the equation. 80 + -80 + -25.12k = 0.00 + -80 Combine like terms: 80 + -80 = 0 0 + -25.12k = 0.00 + -80 -25.12k = 0.00 + -80 Combine like terms: 0.00 + -80 = -80 -25.12k = -80 Divide each side by '-25.12'. k = 3.184713376 Simplifying k = 3.184713376
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