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Simplifying (7 + -1u)(3u + -1) = 0 Reorder the terms: (7 + -1u)(-1 + 3u) = 0 Multiply (7 + -1u) * (-1 + 3u) (7(-1 + 3u) + -1u * (-1 + 3u)) = 0 ((-1 * 7 + 3u * 7) + -1u * (-1 + 3u)) = 0 ((-7 + 21u) + -1u * (-1 + 3u)) = 0 (-7 + 21u + (-1 * -1u + 3u * -1u)) = 0 (-7 + 21u + (1u + -3u2)) = 0 Combine like terms: 21u + 1u = 22u (-7 + 22u + -3u2) = 0 Solving -7 + 22u + -3u2 = 0 Solving for variable 'u'. Factor a trinomial. (-7 + u)(1 + -3u) = 0Subproblem 1
Set the factor '(-7 + u)' equal to zero and attempt to solve: Simplifying -7 + u = 0 Solving -7 + u = 0 Move all terms containing u to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + u = 0 + 7 Combine like terms: -7 + 7 = 0 0 + u = 0 + 7 u = 0 + 7 Combine like terms: 0 + 7 = 7 u = 7 Simplifying u = 7Subproblem 2
Set the factor '(1 + -3u)' equal to zero and attempt to solve: Simplifying 1 + -3u = 0 Solving 1 + -3u = 0 Move all terms containing u to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -3u = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3u = 0 + -1 -3u = 0 + -1 Combine like terms: 0 + -1 = -1 -3u = -1 Divide each side by '-3'. u = 0.3333333333 Simplifying u = 0.3333333333Solution
u = {7, 0.3333333333}
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