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Simplifying l + l + w + w = 21 + 2w Combine like terms: l + l = 2l 2l + w + w = 21 + 2w Combine like terms: w + w = 2w 2l + 2w = 21 + 2w Add '-2w' to each side of the equation. 2l + 2w + -2w = 21 + 2w + -2w Combine like terms: 2w + -2w = 0 2l + 0 = 21 + 2w + -2w 2l = 21 + 2w + -2w Combine like terms: 2w + -2w = 0 2l = 21 + 0 2l = 21 Solving 2l = 21 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Divide each side by '2'. l = 10.5 Simplifying l = 10.5
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