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Simplifying 20 + 4u = 5u + 7 Reorder the terms: 20 + 4u = 7 + 5u Solving 20 + 4u = 7 + 5u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-5u' to each side of the equation. 20 + 4u + -5u = 7 + 5u + -5u Combine like terms: 4u + -5u = -1u 20 + -1u = 7 + 5u + -5u Combine like terms: 5u + -5u = 0 20 + -1u = 7 + 0 20 + -1u = 7 Add '-20' to each side of the equation. 20 + -20 + -1u = 7 + -20 Combine like terms: 20 + -20 = 0 0 + -1u = 7 + -20 -1u = 7 + -20 Combine like terms: 7 + -20 = -13 -1u = -13 Divide each side by '-1'. u = 13 Simplifying u = 13
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