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Simplifying -4.2 = 0.8u + 0.2u Combine like terms: 0.8u + 0.2u = 1u -4.2 = 1u Solving -4.2 = 1u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. -4.2 + -1u = 1u + -1u Combine like terms: 1u + -1u = 0 -4.2 + -1u = 0 Add '4.2' to each side of the equation. -4.2 + 4.2 + -1u = 0 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + -1u = 0 + 4.2 -1u = 0 + 4.2 Combine like terms: 0 + 4.2 = 4.2 -1u = 4.2 Divide each side by '-1'. u = -4.2 Simplifying u = -4.2
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