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Simplifying 15 = 7 + 2u Solving 15 = 7 + 2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-2u' to each side of the equation. 15 + -2u = 7 + 2u + -2u Combine like terms: 2u + -2u = 0 15 + -2u = 7 + 0 15 + -2u = 7 Add '-15' to each side of the equation. 15 + -15 + -2u = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -2u = 7 + -15 -2u = 7 + -15 Combine like terms: 7 + -15 = -8 -2u = -8 Divide each side by '-2'. u = 4 Simplifying u = 4
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