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Simplifying 2x + -1y + 3z + u = 4 Reorder the terms: u + 2x + -1y + 3z = 4 Solving u + 2x + -1y + 3z = 4 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. u + 2x + -1y + -2x + 3z = 4 + -2x Reorder the terms: u + 2x + -2x + -1y + 3z = 4 + -2x Combine like terms: 2x + -2x = 0 u + 0 + -1y + 3z = 4 + -2x u + -1y + 3z = 4 + -2x Add 'y' to each side of the equation. u + -1y + y + 3z = 4 + -2x + y Combine like terms: -1y + y = 0 u + 0 + 3z = 4 + -2x + y u + 3z = 4 + -2x + y Add '-3z' to each side of the equation. u + 3z + -3z = 4 + -2x + y + -3z Combine like terms: 3z + -3z = 0 u + 0 = 4 + -2x + y + -3z u = 4 + -2x + y + -3z Simplifying u = 4 + -2x + y + -3z
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