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Simplifying 7 + -9u = -20 Solving 7 + -9u = -20 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -9u = -20 + -7 Combine like terms: 7 + -7 = 0 0 + -9u = -20 + -7 -9u = -20 + -7 Combine like terms: -20 + -7 = -27 -9u = -27 Divide each side by '-9'. u = 3 Simplifying u = 3
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