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Simplifying 4 = -3u + -1(-7) Multiply -1 * -7 4 = -3u + 7 Reorder the terms: 4 = 7 + -3u Solving 4 = 7 + -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. 4 + 3u = 7 + -3u + 3u Combine like terms: -3u + 3u = 0 4 + 3u = 7 + 0 4 + 3u = 7 Add '-4' to each side of the equation. 4 + -4 + 3u = 7 + -4 Combine like terms: 4 + -4 = 0 0 + 3u = 7 + -4 3u = 7 + -4 Combine like terms: 7 + -4 = 3 3u = 3 Divide each side by '3'. u = 1 Simplifying u = 1
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