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Simplifying 2u + 4 + -2(-9u + -4) = 2(u + -1) Reorder the terms: 2u + 4 + -2(-4 + -9u) = 2(u + -1) 2u + 4 + (-4 * -2 + -9u * -2) = 2(u + -1) 2u + 4 + (8 + 18u) = 2(u + -1) Reorder the terms: 4 + 8 + 2u + 18u = 2(u + -1) Combine like terms: 4 + 8 = 12 12 + 2u + 18u = 2(u + -1) Combine like terms: 2u + 18u = 20u 12 + 20u = 2(u + -1) Reorder the terms: 12 + 20u = 2(-1 + u) 12 + 20u = (-1 * 2 + u * 2) 12 + 20u = (-2 + 2u) Solving 12 + 20u = -2 + 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. 12 + 20u + -2u = -2 + 2u + -2u Combine like terms: 20u + -2u = 18u 12 + 18u = -2 + 2u + -2u Combine like terms: 2u + -2u = 0 12 + 18u = -2 + 0 12 + 18u = -2 Add '-12' to each side of the equation. 12 + -12 + 18u = -2 + -12 Combine like terms: 12 + -12 = 0 0 + 18u = -2 + -12 18u = -2 + -12 Combine like terms: -2 + -12 = -14 18u = -14 Divide each side by '18'. u = -0.7777777778 Simplifying u = -0.7777777778
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