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Simplifying -2.1 = -0.8u + 0.5u Combine like terms: -0.8u + 0.5u = -0.3u -2.1 = -0.3u Solving -2.1 = -0.3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.3u' to each side of the equation. -2.1 + 0.3u = -0.3u + 0.3u Combine like terms: -0.3u + 0.3u = 0.0 -2.1 + 0.3u = 0.0 Add '2.1' to each side of the equation. -2.1 + 2.1 + 0.3u = 0.0 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + 0.3u = 0.0 + 2.1 0.3u = 0.0 + 2.1 Combine like terms: 0.0 + 2.1 = 2.1 0.3u = 2.1 Divide each side by '0.3'. u = 7 Simplifying u = 7
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