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Simplifying 5u + -7 + u = 7u + 21 + -5u Reorder the terms: -7 + 5u + u = 7u + 21 + -5u Combine like terms: 5u + u = 6u -7 + 6u = 7u + 21 + -5u Reorder the terms: -7 + 6u = 21 + 7u + -5u Combine like terms: 7u + -5u = 2u -7 + 6u = 21 + 2u Solving -7 + 6u = 21 + 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 + 6u + -2u = 21 + 2u + -2u Combine like terms: 6u + -2u = 4u -7 + 4u = 21 + 2u + -2u Combine like terms: 2u + -2u = 0 -7 + 4u = 21 + 0 -7 + 4u = 21 Add '7' to each side of the equation. -7 + 7 + 4u = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 4u = 21 + 7 4u = 21 + 7 Combine like terms: 21 + 7 = 28 4u = 28 Divide each side by '4'. u = 7 Simplifying u = 7
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