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Simplifying -18 = u + -1(-4) Multiply -1 * -4 -18 = u + 4 Reorder the terms: -18 = 4 + u Solving -18 = 4 + 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. -18 + -1u = 4 + u + -1u Combine like terms: u + -1u = 0 -18 + -1u = 4 + 0 -18 + -1u = 4 Add '18' to each side of the equation. -18 + 18 + -1u = 4 + 18 Combine like terms: -18 + 18 = 0 0 + -1u = 4 + 18 -1u = 4 + 18 Combine like terms: 4 + 18 = 22 -1u = 22 Divide each side by '-1'. u = -22 Simplifying u = -22
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