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Simplifying 84 = 2l * 2w Reorder the terms for easier multiplication: 84 = 2 * 2l * w Multiply 2 * 2 84 = 4l * w Multiply l * w 84 = 4lw Solving 84 = 4lw Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-4lw' to each side of the equation. 84 + -4lw = 4lw + -4lw Combine like terms: 4lw + -4lw = 0 84 + -4lw = 0 Add '-84' to each side of the equation. 84 + -84 + -4lw = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -4lw = 0 + -84 -4lw = 0 + -84 Combine like terms: 0 + -84 = -84 -4lw = -84 Divide each side by '-4w'. l = 21w-1 Simplifying l = 21w-1
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