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Simplifying 4u + -7 = u + (4 + u) Reorder the terms: -7 + 4u = u + (4 + u) Remove parenthesis around (4 + u) -7 + 4u = u + 4 + u Reorder the terms: -7 + 4u = 4 + u + u Combine like terms: u + u = 2u -7 + 4u = 4 + 2u Solving -7 + 4u = 4 + 2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-2u' to each side of the equation. -7 + 4u + -2u = 4 + 2u + -2u Combine like terms: 4u + -2u = 2u -7 + 2u = 4 + 2u + -2u Combine like terms: 2u + -2u = 0 -7 + 2u = 4 + 0 -7 + 2u = 4 Add '7' to each side of the equation. -7 + 7 + 2u = 4 + 7 Combine like terms: -7 + 7 = 0 0 + 2u = 4 + 7 2u = 4 + 7 Combine like terms: 4 + 7 = 11 2u = 11 Divide each side by '2'. u = 5.5 Simplifying u = 5.5
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