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Simplifying -20(5u + -4v + 9w) = 0 (5u * -20 + -4v * -20 + 9w * -20) = 0 (-100u + 80v + -180w) = 0 Solving -100u + 80v + -180w = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-80v' to each side of the equation. -100u + 80v + -80v + -180w = 0 + -80v Combine like terms: 80v + -80v = 0 -100u + 0 + -180w = 0 + -80v -100u + -180w = 0 + -80v Remove the zero: -100u + -180w = -80v Add '180w' to each side of the equation. -100u + -180w + 180w = -80v + 180w Combine like terms: -180w + 180w = 0 -100u + 0 = -80v + 180w -100u = -80v + 180w Divide each side by '-100'. u = 0.8v + -1.8w Simplifying u = 0.8v + -1.8w
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