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Simplifying -15 = -7u + 6 Reorder the terms: -15 = 6 + -7u Solving -15 = 6 + -7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '7u' to each side of the equation. -15 + 7u = 6 + -7u + 7u Combine like terms: -7u + 7u = 0 -15 + 7u = 6 + 0 -15 + 7u = 6 Add '15' to each side of the equation. -15 + 15 + 7u = 6 + 15 Combine like terms: -15 + 15 = 0 0 + 7u = 6 + 15 7u = 6 + 15 Combine like terms: 6 + 15 = 21 7u = 21 Divide each side by '7'. u = 3 Simplifying u = 3
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