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Simplifying 91 = 21u + 7 Reorder the terms: 91 = 7 + 21u Solving 91 = 7 + 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 + -21u = 7 + 21u + -21u Combine like terms: 21u + -21u = 0 91 + -21u = 7 + 0 91 + -21u = 7 Add '-91' to each side of the equation. 91 + -91 + -21u = 7 + -91 Combine like terms: 91 + -91 = 0 0 + -21u = 7 + -91 -21u = 7 + -91 Combine like terms: 7 + -91 = -84 -21u = -84 Divide each side by '-21'. u = 4 Simplifying u = 4
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