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Simplifying 9 + -2(15 + u) + 7(u + -5) = 0 9 + (15 * -2 + u * -2) + 7(u + -5) = 0 9 + (-30 + -2u) + 7(u + -5) = 0 Reorder the terms: 9 + -30 + -2u + 7(-5 + u) = 0 9 + -30 + -2u + (-5 * 7 + u * 7) = 0 9 + -30 + -2u + (-35 + 7u) = 0 Reorder the terms: 9 + -30 + -35 + -2u + 7u = 0 Combine like terms: 9 + -30 = -21 -21 + -35 + -2u + 7u = 0 Combine like terms: -21 + -35 = -56 -56 + -2u + 7u = 0 Combine like terms: -2u + 7u = 5u -56 + 5u = 0 Solving -56 + 5u = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '56' to each side of the equation. -56 + 56 + 5u = 0 + 56 Combine like terms: -56 + 56 = 0 0 + 5u = 0 + 56 5u = 0 + 56 Combine like terms: 0 + 56 = 56 5u = 56 Divide each side by '5'. u = 11.2 Simplifying u = 11.2
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