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Simplifying 90u + 81v = 0 Solving 90u + 81v = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-81v' to each side of the equation. 90u + 81v + -81v = 0 + -81v Combine like terms: 81v + -81v = 0 90u + 0 = 0 + -81v 90u = 0 + -81v Remove the zero: 90u = -81v Divide each side by '90'. u = -0.9v Simplifying u = -0.9v
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