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Simplifying (5 + -5k) * 2 = 90 Reorder the terms for easier multiplication: 2(5 + -5k) = 90 (5 * 2 + -5k * 2) = 90 (10 + -10k) = 90 Solving 10 + -10k = 90 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -10k = 90 + -10 Combine like terms: 10 + -10 = 0 0 + -10k = 90 + -10 -10k = 90 + -10 Combine like terms: 90 + -10 = 80 -10k = 80 Divide each side by '-10'. k = -8 Simplifying k = -8
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