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Simplifying 4.2 = 3.15 + u Solving 4.2 = 3.15 + u 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 = 3.15 + u + -1u Combine like terms: u + -1u = 0 4.2 + -1u = 3.15 + 0 4.2 + -1u = 3.15 Add '-4.2' to each side of the equation. 4.2 + -4.2 + -1u = 3.15 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + -1u = 3.15 + -4.2 -1u = 3.15 + -4.2 Combine like terms: 3.15 + -4.2 = -1.05 -1u = -1.05 Divide each side by '-1'. u = 1.05 Simplifying u = 1.05
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