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Simplifying -2.8 = -0.8u + 0.4u Combine like terms: -0.8u + 0.4u = -0.4u -2.8 = -0.4u Solving -2.8 = -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. -2.8 + 0.4u = -0.4u + 0.4u Combine like terms: -0.4u + 0.4u = 0.0 -2.8 + 0.4u = 0.0 Add '2.8' to each side of the equation. -2.8 + 2.8 + 0.4u = 0.0 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + 0.4u = 0.0 + 2.8 0.4u = 0.0 + 2.8 Combine like terms: 0.0 + 2.8 = 2.8 0.4u = 2.8 Divide each side by '0.4'. u = 7 Simplifying u = 7
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