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Simplifying 9u + -2u + -7 = 21 Reorder the terms: -7 + 9u + -2u = 21 Combine like terms: 9u + -2u = 7u -7 + 7u = 21 Solving -7 + 7u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 7u = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 7u = 21 + 7 7u = 21 + 7 Combine like terms: 21 + 7 = 28 7u = 28 Divide each side by '7'. u = 4 Simplifying u = 4
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