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Simplifying 15(k + 1) = -4 Reorder the terms: 15(1 + k) = -4 (1 * 15 + k * 15) = -4 (15 + 15k) = -4 Solving 15 + 15k = -4 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 15k = -4 + -15 Combine like terms: 15 + -15 = 0 0 + 15k = -4 + -15 15k = -4 + -15 Combine like terms: -4 + -15 = -19 15k = -19 Divide each side by '15'. k = -1.266666667 Simplifying k = -1.266666667
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