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Simplifying 10u + -21 = -8u + 18 Reorder the terms: -21 + 10u = -8u + 18 Reorder the terms: -21 + 10u = 18 + -8u Solving -21 + 10u = 18 + -8u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '8u' to each side of the equation. -21 + 10u + 8u = 18 + -8u + 8u Combine like terms: 10u + 8u = 18u -21 + 18u = 18 + -8u + 8u Combine like terms: -8u + 8u = 0 -21 + 18u = 18 + 0 -21 + 18u = 18 Add '21' to each side of the equation. -21 + 21 + 18u = 18 + 21 Combine like terms: -21 + 21 = 0 0 + 18u = 18 + 21 18u = 18 + 21 Combine like terms: 18 + 21 = 39 18u = 39 Divide each side by '18'. u = 2.166666667 Simplifying u = 2.166666667
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