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Simplifying 91 = 4u + 15 Reorder the terms: 91 = 15 + 4u Solving 91 = 15 + 4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4u' to each side of the equation. 91 + -4u = 15 + 4u + -4u Combine like terms: 4u + -4u = 0 91 + -4u = 15 + 0 91 + -4u = 15 Add '-91' to each side of the equation. 91 + -91 + -4u = 15 + -91 Combine like terms: 91 + -91 = 0 0 + -4u = 15 + -91 -4u = 15 + -91 Combine like terms: 15 + -91 = -76 -4u = -76 Divide each side by '-4'. u = 19 Simplifying u = 19
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