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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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