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Simplifying -5(3 + 4k) = -115 (3 * -5 + 4k * -5) = -115 (-15 + -20k) = -115 Solving -15 + -20k = -115 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 + -20k = -115 + 15 Combine like terms: -15 + 15 = 0 0 + -20k = -115 + 15 -20k = -115 + 15 Combine like terms: -115 + 15 = -100 -20k = -100 Divide each side by '-20'. k = 5 Simplifying k = 5
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