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Simplifying 7u + -1(-4u) + 4 + -15 = 0 Remove parenthesis around (-4u) 7u + -1 * -4u + 4 + -15 = 0 Multiply -1 * -4 7u + 4u + 4 + -15 = 0 Reorder the terms: 4 + -15 + 7u + 4u = 0 Combine like terms: 4 + -15 = -11 -11 + 7u + 4u = 0 Combine like terms: 7u + 4u = 11u -11 + 11u = 0 Solving -11 + 11u = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + 11u = 0 + 11 Combine like terms: -11 + 11 = 0 0 + 11u = 0 + 11 11u = 0 + 11 Combine like terms: 0 + 11 = 11 11u = 11 Divide each side by '11'. u = 1 Simplifying u = 1
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