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Simplifying 42 = 18 + -4u Solving 42 = 18 + -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. 42 + 4u = 18 + -4u + 4u Combine like terms: -4u + 4u = 0 42 + 4u = 18 + 0 42 + 4u = 18 Add '-42' to each side of the equation. 42 + -42 + 4u = 18 + -42 Combine like terms: 42 + -42 = 0 0 + 4u = 18 + -42 4u = 18 + -42 Combine like terms: 18 + -42 = -24 4u = -24 Divide each side by '4'. u = -6 Simplifying u = -6
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