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Simplifying 0 = -7u + 5(u + -4) Reorder the terms: 0 = -7u + 5(-4 + u) 0 = -7u + (-4 * 5 + u * 5) 0 = -7u + (-20 + 5u) Reorder the terms: 0 = -20 + -7u + 5u Combine like terms: -7u + 5u = -2u 0 = -20 + -2u Solving 0 = -20 + -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. 0 + 2u = -20 + -2u + 2u Remove the zero: 2u = -20 + -2u + 2u Combine like terms: -2u + 2u = 0 2u = -20 + 0 2u = -20 Divide each side by '2'. u = -10 Simplifying u = -10
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