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Simplifying 13 = 2u + -9 Reorder the terms: 13 = -9 + 2u Solving 13 = -9 + 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. 13 + -2u = -9 + 2u + -2u Combine like terms: 2u + -2u = 0 13 + -2u = -9 + 0 13 + -2u = -9 Add '-13' to each side of the equation. 13 + -13 + -2u = -9 + -13 Combine like terms: 13 + -13 = 0 0 + -2u = -9 + -13 -2u = -9 + -13 Combine like terms: -9 + -13 = -22 -2u = -22 Divide each side by '-2'. u = 11 Simplifying u = 11
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