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Simplifying 7u + -18 = 9(u + -4) Reorder the terms: -18 + 7u = 9(u + -4) Reorder the terms: -18 + 7u = 9(-4 + u) -18 + 7u = (-4 * 9 + u * 9) -18 + 7u = (-36 + 9u) Solving -18 + 7u = -36 + 9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9u' to each side of the equation. -18 + 7u + -9u = -36 + 9u + -9u Combine like terms: 7u + -9u = -2u -18 + -2u = -36 + 9u + -9u Combine like terms: 9u + -9u = 0 -18 + -2u = -36 + 0 -18 + -2u = -36 Add '18' to each side of the equation. -18 + 18 + -2u = -36 + 18 Combine like terms: -18 + 18 = 0 0 + -2u = -36 + 18 -2u = -36 + 18 Combine like terms: -36 + 18 = -18 -2u = -18 Divide each side by '-2'. u = 9 Simplifying u = 9
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