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Simplifying (9x + -1)(4x + 7) = 0 Reorder the terms: (-1 + 9x)(4x + 7) = 0 Reorder the terms: (-1 + 9x)(7 + 4x) = 0 Multiply (-1 + 9x) * (7 + 4x) (-1(7 + 4x) + 9x * (7 + 4x)) = 0 ((7 * -1 + 4x * -1) + 9x * (7 + 4x)) = 0 ((-7 + -4x) + 9x * (7 + 4x)) = 0 (-7 + -4x + (7 * 9x + 4x * 9x)) = 0 (-7 + -4x + (63x + 36x2)) = 0 Combine like terms: -4x + 63x = 59x (-7 + 59x + 36x2) = 0 Solving -7 + 59x + 36x2 = 0 Solving for variable 'x'. Factor a trinomial. (-7 + -4x)(1 + -9x) = 0Subproblem 1
Set the factor '(-7 + -4x)' equal to zero and attempt to solve: Simplifying -7 + -4x = 0 Solving -7 + -4x = 0 Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -4x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -4x = 0 + 7 -4x = 0 + 7 Combine like terms: 0 + 7 = 7 -4x = 7 Divide each side by '-4'. x = -1.75 Simplifying x = -1.75Subproblem 2
Set the factor '(1 + -9x)' equal to zero and attempt to solve: Simplifying 1 + -9x = 0 Solving 1 + -9x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -9x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -9x = 0 + -1 -9x = 0 + -1 Combine like terms: 0 + -1 = -1 -9x = -1 Divide each side by '-9'. x = 0.1111111111 Simplifying x = 0.1111111111Solution
x = {-1.75, 0.1111111111}
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