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Simplifying (u + -4) + -1(u + 7) = 0 Reorder the terms: (-4 + u) + -1(u + 7) = 0 Remove parenthesis around (-4 + u) -4 + u + -1(u + 7) = 0 Reorder the terms: -4 + u + -1(7 + u) = 0 -4 + u + (7 * -1 + u * -1) = 0 -4 + u + (-7 + -1u) = 0 Reorder the terms: -4 + -7 + u + -1u = 0 Combine like terms: -4 + -7 = -11 -11 + u + -1u = 0 Combine like terms: u + -1u = 0 -11 + 0 = 0 -11 = 0 Solving -11 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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