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Simplifying 6u + 10 + -2u = 2(21) Reorder the terms: 10 + 6u + -2u = 2(21) Combine like terms: 6u + -2u = 4u 10 + 4u = 2(21) Multiply 2 * 21 10 + 4u = 42 Solving 10 + 4u = 42 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 4u = 42 + -10 Combine like terms: 10 + -10 = 0 0 + 4u = 42 + -10 4u = 42 + -10 Combine like terms: 42 + -10 = 32 4u = 32 Divide each side by '4'. u = 8 Simplifying u = 8
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