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Simplifying -7u + -8 = -2(u + 9) Reorder the terms: -8 + -7u = -2(u + 9) Reorder the terms: -8 + -7u = -2(9 + u) -8 + -7u = (9 * -2 + u * -2) -8 + -7u = (-18 + -2u) Solving -8 + -7u = -18 + -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. -8 + -7u + 2u = -18 + -2u + 2u Combine like terms: -7u + 2u = -5u -8 + -5u = -18 + -2u + 2u Combine like terms: -2u + 2u = 0 -8 + -5u = -18 + 0 -8 + -5u = -18 Add '8' to each side of the equation. -8 + 8 + -5u = -18 + 8 Combine like terms: -8 + 8 = 0 0 + -5u = -18 + 8 -5u = -18 + 8 Combine like terms: -18 + 8 = -10 -5u = -10 Divide each side by '-5'. u = 2 Simplifying u = 2
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