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Simplifying 20k + 90 = 10 + 130 Reorder the terms: 90 + 20k = 10 + 130 Combine like terms: 10 + 130 = 140 90 + 20k = 140 Solving 90 + 20k = 140 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 20k = 140 + -90 Combine like terms: 90 + -90 = 0 0 + 20k = 140 + -90 20k = 140 + -90 Combine like terms: 140 + -90 = 50 20k = 50 Divide each side by '20'. k = 2.5 Simplifying k = 2.5
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