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Simplifying 2u + 3(u + -7) = -1 Reorder the terms: 2u + 3(-7 + u) = -1 2u + (-7 * 3 + u * 3) = -1 2u + (-21 + 3u) = -1 Reorder the terms: -21 + 2u + 3u = -1 Combine like terms: 2u + 3u = 5u -21 + 5u = -1 Solving -21 + 5u = -1 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 + 5u = -1 + 21 Combine like terms: -21 + 21 = 0 0 + 5u = -1 + 21 5u = -1 + 21 Combine like terms: -1 + 21 = 20 5u = 20 Divide each side by '5'. u = 4 Simplifying u = 4
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