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Simplifying 90 = 4u + 10 Reorder the terms: 90 = 10 + 4u Solving 90 = 10 + 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. 90 + -4u = 10 + 4u + -4u Combine like terms: 4u + -4u = 0 90 + -4u = 10 + 0 90 + -4u = 10 Add '-90' to each side of the equation. 90 + -90 + -4u = 10 + -90 Combine like terms: 90 + -90 = 0 0 + -4u = 10 + -90 -4u = 10 + -90 Combine like terms: 10 + -90 = -80 -4u = -80 Divide each side by '-4'. u = 20 Simplifying u = 20
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