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Simplifying (7 + -2x)(2x + -7) = -9 Reorder the terms: (7 + -2x)(-7 + 2x) = -9 Multiply (7 + -2x) * (-7 + 2x) (7(-7 + 2x) + -2x * (-7 + 2x)) = -9 ((-7 * 7 + 2x * 7) + -2x * (-7 + 2x)) = -9 ((-49 + 14x) + -2x * (-7 + 2x)) = -9 (-49 + 14x + (-7 * -2x + 2x * -2x)) = -9 (-49 + 14x + (14x + -4x2)) = -9 Combine like terms: 14x + 14x = 28x (-49 + 28x + -4x2) = -9 Solving -49 + 28x + -4x2 = -9 Solving for variable 'x'. Reorder the terms: -49 + 9 + 28x + -4x2 = -9 + 9 Combine like terms: -49 + 9 = -40 -40 + 28x + -4x2 = -9 + 9 Combine like terms: -9 + 9 = 0 -40 + 28x + -4x2 = 0 Factor out the Greatest Common Factor (GCF), '4'. 4(-10 + 7x + -1x2) = 0 Factor a trinomial. 4((-5 + x)(2 + -1x)) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(-5 + x)' equal to zero and attempt to solve: Simplifying -5 + x = 0 Solving -5 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + x = 0 + 5 x = 0 + 5 Combine like terms: 0 + 5 = 5 x = 5 Simplifying x = 5Subproblem 2
Set the factor '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2Solution
x = {5, 2}
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