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Simplifying 7 = 3(u + -7) + 4u Reorder the terms: 7 = 3(-7 + u) + 4u 7 = (-7 * 3 + u * 3) + 4u 7 = (-21 + 3u) + 4u Combine like terms: 3u + 4u = 7u 7 = -21 + 7u Solving 7 = -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 + -7u = -21 + 7u + -7u Combine like terms: 7u + -7u = 0 7 + -7u = -21 + 0 7 + -7u = -21 Add '-7' to each side of the equation. 7 + -7 + -7u = -21 + -7 Combine like terms: 7 + -7 = 0 0 + -7u = -21 + -7 -7u = -21 + -7 Combine like terms: -21 + -7 = -28 -7u = -28 Divide each side by '-7'. u = 4 Simplifying u = 4
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