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Simplifying (3x + 7y)(-7x + -1y) = 0 Multiply (3x + 7y) * (-7x + -1y) (3x * (-7x + -1y) + 7y * (-7x + -1y)) = 0 ((-7x * 3x + -1y * 3x) + 7y * (-7x + -1y)) = 0 Reorder the terms: ((-3xy + -21x2) + 7y * (-7x + -1y)) = 0 ((-3xy + -21x2) + 7y * (-7x + -1y)) = 0 (-3xy + -21x2 + (-7x * 7y + -1y * 7y)) = 0 (-3xy + -21x2 + (-49xy + -7y2)) = 0 Reorder the terms: (-3xy + -49xy + -21x2 + -7y2) = 0 Combine like terms: -3xy + -49xy = -52xy (-52xy + -21x2 + -7y2) = 0 Solving -52xy + -21x2 + -7y2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '-1'. -1(52xy + 21x2 + 7y2) = 0 Factor a trinomial. -1((7x + y)(3x + 7y)) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(7x + y)' equal to zero and attempt to solve: Simplifying 7x + y = 0 Solving 7x + y = 0 Move all terms containing x to the left, all other terms to the right. Add '-1y' to each side of the equation. 7x + y + -1y = 0 + -1y Combine like terms: y + -1y = 0 7x + 0 = 0 + -1y 7x = 0 + -1y Remove the zero: 7x = -1y Divide each side by '7'. x = -0.1428571429y Simplifying x = -0.1428571429ySubproblem 2
Set the factor '(3x + 7y)' equal to zero and attempt to solve: Simplifying 3x + 7y = 0 Solving 3x + 7y = 0 Move all terms containing x to the left, all other terms to the right. Add '-7y' to each side of the equation. 3x + 7y + -7y = 0 + -7y Combine like terms: 7y + -7y = 0 3x + 0 = 0 + -7y 3x = 0 + -7y Remove the zero: 3x = -7y Divide each side by '3'. x = -2.333333333y Simplifying x = -2.333333333ySolution
x = {-0.1428571429y, -2.333333333y}
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