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Simplifying 3u + -7 = 7(u + 3) Reorder the terms: -7 + 3u = 7(u + 3) Reorder the terms: -7 + 3u = 7(3 + u) -7 + 3u = (3 * 7 + u * 7) -7 + 3u = (21 + 7u) Solving -7 + 3u = 21 + 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. -7 + 3u + -7u = 21 + 7u + -7u Combine like terms: 3u + -7u = -4u -7 + -4u = 21 + 7u + -7u Combine like terms: 7u + -7u = 0 -7 + -4u = 21 + 0 -7 + -4u = 21 Add '7' to each side of the equation. -7 + 7 + -4u = 21 + 7 Combine like terms: -7 + 7 = 0 0 + -4u = 21 + 7 -4u = 21 + 7 Combine like terms: 21 + 7 = 28 -4u = 28 Divide each side by '-4'. u = -7 Simplifying u = -7
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