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Simplifying ux + -7u + -3x + 21 = 0 Reorder the terms: 21 + -7u + ux + -3x = 0 Solving 21 + -7u + ux + -3x = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -7u + ux + -21 + -3x = 0 + -21 Reorder the terms: 21 + -21 + -7u + ux + -3x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7u + ux + -3x = 0 + -21 -7u + ux + -3x = 0 + -21 Combine like terms: 0 + -21 = -21 -7u + ux + -3x = -21 Add '3x' to each side of the equation. -7u + ux + -3x + 3x = -21 + 3x Combine like terms: -3x + 3x = 0 -7u + ux + 0 = -21 + 3x -7u + ux = -21 + 3x Reorder the terms: 21 + -7u + ux + -3x = -21 + 3x + 21 + -3x Reorder the terms: 21 + -7u + ux + -3x = -21 + 21 + 3x + -3x Combine like terms: -21 + 21 = 0 21 + -7u + ux + -3x = 0 + 3x + -3x 21 + -7u + ux + -3x = 3x + -3x Combine like terms: 3x + -3x = 0 21 + -7u + ux + -3x = 0 The solution to this equation could not be determined.
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