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Simplifying -4.2 = -0.8u + 0.2u Combine like terms: -0.8u + 0.2u = -0.6u -4.2 = -0.6u Solving -4.2 = -0.6u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.6u' to each side of the equation. -4.2 + 0.6u = -0.6u + 0.6u Combine like terms: -0.6u + 0.6u = 0.0 -4.2 + 0.6u = 0.0 Add '4.2' to each side of the equation. -4.2 + 4.2 + 0.6u = 0.0 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + 0.6u = 0.0 + 4.2 0.6u = 0.0 + 4.2 Combine like terms: 0.0 + 4.2 = 4.2 0.6u = 4.2 Divide each side by '0.6'. u = 7 Simplifying u = 7
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