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Simplifying x + 49 = x + -31 + u Reorder the terms: 49 + x = x + -31 + u Reorder the terms: 49 + x = -31 + u + x Add '-1x' to each side of the equation. 49 + x + -1x = -31 + u + x + -1x Combine like terms: x + -1x = 0 49 + 0 = -31 + u + x + -1x 49 = -31 + u + x + -1x Combine like terms: x + -1x = 0 49 = -31 + u + 0 49 = -31 + u Solving 49 = -31 + 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. 49 + -1u = -31 + u + -1u Combine like terms: u + -1u = 0 49 + -1u = -31 + 0 49 + -1u = -31 Add '-49' to each side of the equation. 49 + -49 + -1u = -31 + -49 Combine like terms: 49 + -49 = 0 0 + -1u = -31 + -49 -1u = -31 + -49 Combine like terms: -31 + -49 = -80 -1u = -80 Divide each side by '-1'. u = 80 Simplifying u = 80
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