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Simplifying 7(u + -90) = 21 Reorder the terms: 7(-90 + u) = 21 (-90 * 7 + u * 7) = 21 (-630 + 7u) = 21 Solving -630 + 7u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '630' to each side of the equation. -630 + 630 + 7u = 21 + 630 Combine like terms: -630 + 630 = 0 0 + 7u = 21 + 630 7u = 21 + 630 Combine like terms: 21 + 630 = 651 7u = 651 Divide each side by '7'. u = 93 Simplifying u = 93
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