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Simplifying -7[k + 9] = 9[k + -5] + -14k Reorder the terms: -7[9 + k] = 9[k + -5] + -14k [9 * -7 + k * -7] = 9[k + -5] + -14k [-63 + -7k] = 9[k + -5] + -14k Reorder the terms: -63 + -7k = 9[-5 + k] + -14k -63 + -7k = [-5 * 9 + k * 9] + -14k -63 + -7k = [-45 + 9k] + -14k Combine like terms: 9k + -14k = -5k -63 + -7k = -45 + -5k Solving -63 + -7k = -45 + -5k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '5k' to each side of the equation. -63 + -7k + 5k = -45 + -5k + 5k Combine like terms: -7k + 5k = -2k -63 + -2k = -45 + -5k + 5k Combine like terms: -5k + 5k = 0 -63 + -2k = -45 + 0 -63 + -2k = -45 Add '63' to each side of the equation. -63 + 63 + -2k = -45 + 63 Combine like terms: -63 + 63 = 0 0 + -2k = -45 + 63 -2k = -45 + 63 Combine like terms: -45 + 63 = 18 -2k = 18 Divide each side by '-2'. k = -9 Simplifying k = -9
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