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Simplifying 10 + -21 = 7u Combine like terms: 10 + -21 = -11 -11 = 7u Solving -11 = 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. -11 + -7u = 7u + -7u Combine like terms: 7u + -7u = 0 -11 + -7u = 0 Add '11' to each side of the equation. -11 + 11 + -7u = 0 + 11 Combine like terms: -11 + 11 = 0 0 + -7u = 0 + 11 -7u = 0 + 11 Combine like terms: 0 + 11 = 11 -7u = 11 Divide each side by '-7'. u = -1.571428571 Simplifying u = -1.571428571
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