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Simplifying -9 = 2u + -7 Reorder the terms: -9 = -7 + 2u Solving -9 = -7 + 2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-2u' to each side of the equation. -9 + -2u = -7 + 2u + -2u Combine like terms: 2u + -2u = 0 -9 + -2u = -7 + 0 -9 + -2u = -7 Add '9' to each side of the equation. -9 + 9 + -2u = -7 + 9 Combine like terms: -9 + 9 = 0 0 + -2u = -7 + 9 -2u = -7 + 9 Combine like terms: -7 + 9 = 2 -2u = 2 Divide each side by '-2'. u = -1 Simplifying u = -1
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