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Simplifying -3(u + -7) = 4u + -49 Reorder the terms: -3(-7 + u) = 4u + -49 (-7 * -3 + u * -3) = 4u + -49 (21 + -3u) = 4u + -49 Reorder the terms: 21 + -3u = -49 + 4u Solving 21 + -3u = -49 + 4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4u' to each side of the equation. 21 + -3u + -4u = -49 + 4u + -4u Combine like terms: -3u + -4u = -7u 21 + -7u = -49 + 4u + -4u Combine like terms: 4u + -4u = 0 21 + -7u = -49 + 0 21 + -7u = -49 Add '-21' to each side of the equation. 21 + -21 + -7u = -49 + -21 Combine like terms: 21 + -21 = 0 0 + -7u = -49 + -21 -7u = -49 + -21 Combine like terms: -49 + -21 = -70 -7u = -70 Divide each side by '-7'. u = 10 Simplifying u = 10
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