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Simplifying -21 = 7 + 4u Solving -21 = 7 + 4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4u' to each side of the equation. -21 + -4u = 7 + 4u + -4u Combine like terms: 4u + -4u = 0 -21 + -4u = 7 + 0 -21 + -4u = 7 Add '21' to each side of the equation. -21 + 21 + -4u = 7 + 21 Combine like terms: -21 + 21 = 0 0 + -4u = 7 + 21 -4u = 7 + 21 Combine like terms: 7 + 21 = 28 -4u = 28 Divide each side by '-4'. u = -7 Simplifying u = -7
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