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Simplifying 7 = u + 4 Reorder the terms: 7 = 4 + u Solving 7 = 4 + 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. 7 + -1u = 4 + u + -1u Combine like terms: u + -1u = 0 7 + -1u = 4 + 0 7 + -1u = 4 Add '-7' to each side of the equation. 7 + -7 + -1u = 4 + -7 Combine like terms: 7 + -7 = 0 0 + -1u = 4 + -7 -1u = 4 + -7 Combine like terms: 4 + -7 = -3 -1u = -3 Divide each side by '-1'. u = 3 Simplifying u = 3
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