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Simplifying -1(-1x + -1u) + (3u + x) = 0 Reorder the terms: -1(-1u + -1x) + (3u + x) = 0 (-1u * -1 + -1x * -1) + (3u + x) = 0 (1u + 1x) + (3u + x) = 0 Remove parenthesis around (3u + x) 1u + 1x + 3u + x = 0 Reorder the terms: 1u + 3u + 1x + x = 0 Combine like terms: 1u + 3u = 4u 4u + 1x + x = 0 Combine like terms: 1x + x = 2x 4u + 2x = 0 Solving 4u + 2x = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-2x' to each side of the equation. 4u + 2x + -2x = 0 + -2x Combine like terms: 2x + -2x = 0 4u + 0 = 0 + -2x 4u = 0 + -2x Remove the zero: 4u = -2x Divide each side by '4'. u = -0.5x Simplifying u = -0.5x
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