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