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Simplifying 3(13u + -81) = 21 Reorder the terms: 3(-81 + 13u) = 21 (-81 * 3 + 13u * 3) = 21 (-243 + 39u) = 21 Solving -243 + 39u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '243' to each side of the equation. -243 + 243 + 39u = 21 + 243 Combine like terms: -243 + 243 = 0 0 + 39u = 21 + 243 39u = 21 + 243 Combine like terms: 21 + 243 = 264 39u = 264 Divide each side by '39'. u = 6.769230769 Simplifying u = 6.769230769
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