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Simplifying L + 21 = -1L + 81 Reorder the terms: 21 + L = -1L + 81 Reorder the terms: 21 + L = 81 + -1L Solving 21 + L = 81 + -1L Solving for variable 'L'. Move all terms containing L to the left, all other terms to the right. Add 'L' to each side of the equation. 21 + L + L = 81 + -1L + L Combine like terms: L + L = 2L 21 + 2L = 81 + -1L + L Combine like terms: -1L + L = 0 21 + 2L = 81 + 0 21 + 2L = 81 Add '-21' to each side of the equation. 21 + -21 + 2L = 81 + -21 Combine like terms: 21 + -21 = 0 0 + 2L = 81 + -21 2L = 81 + -21 Combine like terms: 81 + -21 = 60 2L = 60 Divide each side by '2'. L = 30 Simplifying L = 30
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