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Simplifying 21l + 2(80) = 550 Multiply 2 * 80 21l + 160 = 550 Reorder the terms: 160 + 21l = 550 Solving 160 + 21l = 550 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-160' to each side of the equation. 160 + -160 + 21l = 550 + -160 Combine like terms: 160 + -160 = 0 0 + 21l = 550 + -160 21l = 550 + -160 Combine like terms: 550 + -160 = 390 21l = 390 Divide each side by '21'. l = 18.57142857 Simplifying l = 18.57142857
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