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Simplifying -21 = -7 + 2u Solving -21 = -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. -21 + -2u = -7 + 2u + -2u Combine like terms: 2u + -2u = 0 -21 + -2u = -7 + 0 -21 + -2u = -7 Add '21' to each side of the equation. -21 + 21 + -2u = -7 + 21 Combine like terms: -21 + 21 = 0 0 + -2u = -7 + 21 -2u = -7 + 21 Combine like terms: -7 + 21 = 14 -2u = 14 Divide each side by '-2'. u = -7 Simplifying u = -7
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