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Simplifying -7(1 + 3k) + -2k = 131 (1 * -7 + 3k * -7) + -2k = 131 (-7 + -21k) + -2k = 131 Combine like terms: -21k + -2k = -23k -7 + -23k = 131 Solving -7 + -23k = 131 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 + -23k = 131 + 7 Combine like terms: -7 + 7 = 0 0 + -23k = 131 + 7 -23k = 131 + 7 Combine like terms: 131 + 7 = 138 -23k = 138 Divide each side by '-23'. k = -6 Simplifying k = -6
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