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Simplifying -7u + -5u + 20u + -7 = -1 Reorder the terms: -7 + -7u + -5u + 20u = -1 Combine like terms: -7u + -5u = -12u -7 + -12u + 20u = -1 Combine like terms: -12u + 20u = 8u -7 + 8u = -1 Solving -7 + 8u = -1 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 8u = -1 + 7 Combine like terms: -7 + 7 = 0 0 + 8u = -1 + 7 8u = -1 + 7 Combine like terms: -1 + 7 = 6 8u = 6 Divide each side by '8'. u = 0.75 Simplifying u = 0.75
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