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Simplifying -3u + -21 = 3(u + 7) Reorder the terms: -21 + -3u = 3(u + 7) Reorder the terms: -21 + -3u = 3(7 + u) -21 + -3u = (7 * 3 + u * 3) -21 + -3u = (21 + 3u) Solving -21 + -3u = 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. -21 + -3u + -3u = 21 + 3u + -3u Combine like terms: -3u + -3u = -6u -21 + -6u = 21 + 3u + -3u Combine like terms: 3u + -3u = 0 -21 + -6u = 21 + 0 -21 + -6u = 21 Add '21' to each side of the equation. -21 + 21 + -6u = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -6u = 21 + 21 -6u = 21 + 21 Combine like terms: 21 + 21 = 42 -6u = 42 Divide each side by '-6'. u = -7 Simplifying u = -7
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