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Simplifying 5u + -7 = 3(u + -7) Reorder the terms: -7 + 5u = 3(u + -7) Reorder the terms: -7 + 5u = 3(-7 + u) -7 + 5u = (-7 * 3 + u * 3) -7 + 5u = (-21 + 3u) Solving -7 + 5u = -21 + 3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3u' to each side of the equation. -7 + 5u + -3u = -21 + 3u + -3u Combine like terms: 5u + -3u = 2u -7 + 2u = -21 + 3u + -3u Combine like terms: 3u + -3u = 0 -7 + 2u = -21 + 0 -7 + 2u = -21 Add '7' to each side of the equation. -7 + 7 + 2u = -21 + 7 Combine like terms: -7 + 7 = 0 0 + 2u = -21 + 7 2u = -21 + 7 Combine like terms: -21 + 7 = -14 2u = -14 Divide each side by '2'. u = -7 Simplifying u = -7
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