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Simplifying 20 + -1u = -20 + 4u Solving 20 + -1u = -20 + 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. 20 + -1u + -4u = -20 + 4u + -4u Combine like terms: -1u + -4u = -5u 20 + -5u = -20 + 4u + -4u Combine like terms: 4u + -4u = 0 20 + -5u = -20 + 0 20 + -5u = -20 Add '-20' to each side of the equation. 20 + -20 + -5u = -20 + -20 Combine like terms: 20 + -20 = 0 0 + -5u = -20 + -20 -5u = -20 + -20 Combine like terms: -20 + -20 = -40 -5u = -40 Divide each side by '-5'. u = 8 Simplifying u = 8
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