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Simplifying 15 + u + -22 = 81 Reorder the terms: 15 + -22 + u = 81 Combine like terms: 15 + -22 = -7 -7 + u = 81 Solving -7 + u = 81 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 + u = 81 + 7 Combine like terms: -7 + 7 = 0 0 + u = 81 + 7 u = 81 + 7 Combine like terms: 81 + 7 = 88 u = 88 Simplifying u = 88
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