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Simplifying 91 + 7u = 21u Solving 91 + 7u = 21u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-21u' to each side of the equation. 91 + 7u + -21u = 21u + -21u Combine like terms: 7u + -21u = -14u 91 + -14u = 21u + -21u Combine like terms: 21u + -21u = 0 91 + -14u = 0 Add '-91' to each side of the equation. 91 + -91 + -14u = 0 + -91 Combine like terms: 91 + -91 = 0 0 + -14u = 0 + -91 -14u = 0 + -91 Combine like terms: 0 + -91 = -91 -14u = -91 Divide each side by '-14'. u = 6.5 Simplifying u = 6.5
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