9x(x-3)=(2x+5)(x-3)

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Solution for 9x(x-3)=(2x+5)(x-3) equation:


Simplifying
9x(x + -3) = (2x + 5)(x + -3)

Reorder the terms:
9x(-3 + x) = (2x + 5)(x + -3)
(-3 * 9x + x * 9x) = (2x + 5)(x + -3)
(-27x + 9x2) = (2x + 5)(x + -3)

Reorder the terms:
-27x + 9x2 = (5 + 2x)(x + -3)

Reorder the terms:
-27x + 9x2 = (5 + 2x)(-3 + x)

Multiply (5 + 2x) * (-3 + x)
-27x + 9x2 = (5(-3 + x) + 2x * (-3 + x))
-27x + 9x2 = ((-3 * 5 + x * 5) + 2x * (-3 + x))
-27x + 9x2 = ((-15 + 5x) + 2x * (-3 + x))
-27x + 9x2 = (-15 + 5x + (-3 * 2x + x * 2x))
-27x + 9x2 = (-15 + 5x + (-6x + 2x2))

Combine like terms: 5x + -6x = -1x
-27x + 9x2 = (-15 + -1x + 2x2)

Solving
-27x + 9x2 = -15 + -1x + 2x2

Solving for variable 'x'.

Reorder the terms:
15 + -27x + x + 9x2 + -2x2 = -15 + -1x + 2x2 + 15 + x + -2x2

Combine like terms: -27x + x = -26x
15 + -26x + 9x2 + -2x2 = -15 + -1x + 2x2 + 15 + x + -2x2

Combine like terms: 9x2 + -2x2 = 7x2
15 + -26x + 7x2 = -15 + -1x + 2x2 + 15 + x + -2x2

Reorder the terms:
15 + -26x + 7x2 = -15 + 15 + -1x + x + 2x2 + -2x2

Combine like terms: -15 + 15 = 0
15 + -26x + 7x2 = 0 + -1x + x + 2x2 + -2x2
15 + -26x + 7x2 = -1x + x + 2x2 + -2x2

Combine like terms: -1x + x = 0
15 + -26x + 7x2 = 0 + 2x2 + -2x2
15 + -26x + 7x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
15 + -26x + 7x2 = 0

Factor a trinomial.
(5 + -7x)(3 + -1x) = 0

Subproblem 1

Set the factor '(5 + -7x)' equal to zero and attempt to solve: Simplifying 5 + -7x = 0 Solving 5 + -7x = 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 + -7x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -7x = 0 + -5 -7x = 0 + -5 Combine like terms: 0 + -5 = -5 -7x = -5 Divide each side by '-7'. x = 0.7142857143 Simplifying x = 0.7142857143

Subproblem 2

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {0.7142857143, 3}

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