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Simplifying -21 = 5(u + -5) + -7u Reorder the terms: -21 = 5(-5 + u) + -7u -21 = (-5 * 5 + u * 5) + -7u -21 = (-25 + 5u) + -7u Combine like terms: 5u + -7u = -2u -21 = -25 + -2u Solving -21 = -25 + -2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2u' to each side of the equation. -21 + 2u = -25 + -2u + 2u Combine like terms: -2u + 2u = 0 -21 + 2u = -25 + 0 -21 + 2u = -25 Add '21' to each side of the equation. -21 + 21 + 2u = -25 + 21 Combine like terms: -21 + 21 = 0 0 + 2u = -25 + 21 2u = -25 + 21 Combine like terms: -25 + 21 = -4 2u = -4 Divide each side by '2'. u = -2 Simplifying u = -2
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