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Simplifying 2u + -21 + -6u = 3 Reorder the terms: -21 + 2u + -6u = 3 Combine like terms: 2u + -6u = -4u -21 + -4u = 3 Solving -21 + -4u = 3 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -4u = 3 + 21 Combine like terms: -21 + 21 = 0 0 + -4u = 3 + 21 -4u = 3 + 21 Combine like terms: 3 + 21 = 24 -4u = 24 Divide each side by '-4'. u = -6 Simplifying u = -6
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