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Simplifying -21 = 7u Solving -21 = 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. -21 + -7u = 7u + -7u Combine like terms: 7u + -7u = 0 -21 + -7u = 0 Add '21' to each side of the equation. -21 + 21 + -7u = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -7u = 0 + 21 -7u = 0 + 21 Combine like terms: 0 + 21 = 21 -7u = 21 Divide each side by '-7'. u = -3 Simplifying u = -3
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