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Simplifying 5(u + -7) + -7u = -21 Reorder the terms: 5(-7 + u) + -7u = -21 (-7 * 5 + u * 5) + -7u = -21 (-35 + 5u) + -7u = -21 Combine like terms: 5u + -7u = -2u -35 + -2u = -21 Solving -35 + -2u = -21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + -2u = -21 + 35 Combine like terms: -35 + 35 = 0 0 + -2u = -21 + 35 -2u = -21 + 35 Combine like terms: -21 + 35 = 14 -2u = 14 Divide each side by '-2'. u = -7 Simplifying u = -7
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