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Simplifying -0.8 = -0.7u + 0.3u Combine like terms: -0.7u + 0.3u = -0.4u -0.8 = -0.4u Solving -0.8 = -0.4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.4u' to each side of the equation. -0.8 + 0.4u = -0.4u + 0.4u Combine like terms: -0.4u + 0.4u = 0.0 -0.8 + 0.4u = 0.0 Add '0.8' to each side of the equation. -0.8 + 0.8 + 0.4u = 0.0 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + 0.4u = 0.0 + 0.8 0.4u = 0.0 + 0.8 Combine like terms: 0.0 + 0.8 = 0.8 0.4u = 0.8 Divide each side by '0.4'. u = 2 Simplifying u = 2
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