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Simplifying -20 = -7 + u Solving -20 = -7 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. -20 + -1u = -7 + u + -1u Combine like terms: u + -1u = 0 -20 + -1u = -7 + 0 -20 + -1u = -7 Add '20' to each side of the equation. -20 + 20 + -1u = -7 + 20 Combine like terms: -20 + 20 = 0 0 + -1u = -7 + 20 -1u = -7 + 20 Combine like terms: -7 + 20 = 13 -1u = 13 Divide each side by '-1'. u = -13 Simplifying u = -13
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