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Simplifying 90 = 12 + 20lnx Solving 90 = 12 + 20lnx Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-20lnx' to each side of the equation. 90 + -20lnx = 12 + 20lnx + -20lnx Combine like terms: 20lnx + -20lnx = 0 90 + -20lnx = 12 + 0 90 + -20lnx = 12 Add '-90' to each side of the equation. 90 + -90 + -20lnx = 12 + -90 Combine like terms: 90 + -90 = 0 0 + -20lnx = 12 + -90 -20lnx = 12 + -90 Combine like terms: 12 + -90 = -78 -20lnx = -78 Divide each side by '-20nx'. l = 3.9n-1x-1 Simplifying l = 3.9n-1x-1
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