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Simplifying 21(k + 3) + 39 = 711 Reorder the terms: 21(3 + k) + 39 = 711 (3 * 21 + k * 21) + 39 = 711 (63 + 21k) + 39 = 711 Reorder the terms: 63 + 39 + 21k = 711 Combine like terms: 63 + 39 = 102 102 + 21k = 711 Solving 102 + 21k = 711 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-102' to each side of the equation. 102 + -102 + 21k = 711 + -102 Combine like terms: 102 + -102 = 0 0 + 21k = 711 + -102 21k = 711 + -102 Combine like terms: 711 + -102 = 609 21k = 609 Divide each side by '21'. k = 29 Simplifying k = 29
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