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Simplifying 4(1 + 5k) + 3 = 87 (1 * 4 + 5k * 4) + 3 = 87 (4 + 20k) + 3 = 87 Reorder the terms: 4 + 3 + 20k = 87 Combine like terms: 4 + 3 = 7 7 + 20k = 87 Solving 7 + 20k = 87 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 20k = 87 + -7 Combine like terms: 7 + -7 = 0 0 + 20k = 87 + -7 20k = 87 + -7 Combine like terms: 87 + -7 = 80 20k = 80 Divide each side by '20'. k = 4 Simplifying k = 4
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