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Simplifying -7 = 3(u + -5) + -5u Reorder the terms: -7 = 3(-5 + u) + -5u -7 = (-5 * 3 + u * 3) + -5u -7 = (-15 + 3u) + -5u Combine like terms: 3u + -5u = -2u -7 = -15 + -2u Solving -7 = -15 + -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. -7 + 2u = -15 + -2u + 2u Combine like terms: -2u + 2u = 0 -7 + 2u = -15 + 0 -7 + 2u = -15 Add '7' to each side of the equation. -7 + 7 + 2u = -15 + 7 Combine like terms: -7 + 7 = 0 0 + 2u = -15 + 7 2u = -15 + 7 Combine like terms: -15 + 7 = -8 2u = -8 Divide each side by '2'. u = -4 Simplifying u = -4
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