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Simplifying 13 = 4(u + -2) + -7u Reorder the terms: 13 = 4(-2 + u) + -7u 13 = (-2 * 4 + u * 4) + -7u 13 = (-8 + 4u) + -7u Combine like terms: 4u + -7u = -3u 13 = -8 + -3u Solving 13 = -8 + -3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3u' to each side of the equation. 13 + 3u = -8 + -3u + 3u Combine like terms: -3u + 3u = 0 13 + 3u = -8 + 0 13 + 3u = -8 Add '-13' to each side of the equation. 13 + -13 + 3u = -8 + -13 Combine like terms: 13 + -13 = 0 0 + 3u = -8 + -13 3u = -8 + -13 Combine like terms: -8 + -13 = -21 3u = -21 Divide each side by '3'. u = -7 Simplifying u = -7
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