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Simplifying -77 = -7(u + 3) Reorder the terms: -77 = -7(3 + u) -77 = (3 * -7 + u * -7) -77 = (-21 + -7u) Solving -77 = -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. -77 + 7u = -21 + -7u + 7u Combine like terms: -7u + 7u = 0 -77 + 7u = -21 + 0 -77 + 7u = -21 Add '77' to each side of the equation. -77 + 77 + 7u = -21 + 77 Combine like terms: -77 + 77 = 0 0 + 7u = -21 + 77 7u = -21 + 77 Combine like terms: -21 + 77 = 56 7u = 56 Divide each side by '7'. u = 8 Simplifying u = 8
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