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Simplifying 30k + 70 = 20k + 90 Reorder the terms: 70 + 30k = 20k + 90 Reorder the terms: 70 + 30k = 90 + 20k Solving 70 + 30k = 90 + 20k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-20k' to each side of the equation. 70 + 30k + -20k = 90 + 20k + -20k Combine like terms: 30k + -20k = 10k 70 + 10k = 90 + 20k + -20k Combine like terms: 20k + -20k = 0 70 + 10k = 90 + 0 70 + 10k = 90 Add '-70' to each side of the equation. 70 + -70 + 10k = 90 + -70 Combine like terms: 70 + -70 = 0 0 + 10k = 90 + -70 10k = 90 + -70 Combine like terms: 90 + -70 = 20 10k = 20 Divide each side by '10'. k = 2 Simplifying k = 2
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