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Simplifying 4u + -9 = 42u + -15 Reorder the terms: -9 + 4u = 42u + -15 Reorder the terms: -9 + 4u = -15 + 42u Solving -9 + 4u = -15 + 42u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-42u' to each side of the equation. -9 + 4u + -42u = -15 + 42u + -42u Combine like terms: 4u + -42u = -38u -9 + -38u = -15 + 42u + -42u Combine like terms: 42u + -42u = 0 -9 + -38u = -15 + 0 -9 + -38u = -15 Add '9' to each side of the equation. -9 + 9 + -38u = -15 + 9 Combine like terms: -9 + 9 = 0 0 + -38u = -15 + 9 -38u = -15 + 9 Combine like terms: -15 + 9 = -6 -38u = -6 Divide each side by '-38'. u = 0.1578947368 Simplifying u = 0.1578947368
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