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Simplifying 7u + -21 = -7(u + 7) Reorder the terms: -21 + 7u = -7(u + 7) Reorder the terms: -21 + 7u = -7(7 + u) -21 + 7u = (7 * -7 + u * -7) -21 + 7u = (-49 + -7u) Solving -21 + 7u = -49 + -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 = -49 + -7u + 7u Combine like terms: 7u + 7u = 14u -21 + 14u = -49 + -7u + 7u Combine like terms: -7u + 7u = 0 -21 + 14u = -49 + 0 -21 + 14u = -49 Add '21' to each side of the equation. -21 + 21 + 14u = -49 + 21 Combine like terms: -21 + 21 = 0 0 + 14u = -49 + 21 14u = -49 + 21 Combine like terms: -49 + 21 = -28 14u = -28 Divide each side by '14'. u = -2 Simplifying u = -2
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