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Simplifying 21 = 3xu Solving 21 = 3ux Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3ux' to each side of the equation. 21 + -3ux = 3ux + -3ux Combine like terms: 3ux + -3ux = 0 21 + -3ux = 0 Add '-21' to each side of the equation. 21 + -21 + -3ux = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3ux = 0 + -21 -3ux = 0 + -21 Combine like terms: 0 + -21 = -21 -3ux = -21 Divide each side by '-3x'. u = 7x-1 Simplifying u = 7x-1
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