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Simplifying 1 = 2(u + -3) + -9 Reorder the terms: 1 = 2(-3 + u) + -9 1 = (-3 * 2 + u * 2) + -9 1 = (-6 + 2u) + -9 Reorder the terms: 1 = -6 + -9 + 2u Combine like terms: -6 + -9 = -15 1 = -15 + 2u Solving 1 = -15 + 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. 1 + -2u = -15 + 2u + -2u Combine like terms: 2u + -2u = 0 1 + -2u = -15 + 0 1 + -2u = -15 Add '-1' to each side of the equation. 1 + -1 + -2u = -15 + -1 Combine like terms: 1 + -1 = 0 0 + -2u = -15 + -1 -2u = -15 + -1 Combine like terms: -15 + -1 = -16 -2u = -16 Divide each side by '-2'. u = 8 Simplifying u = 8
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