12x^2-7x-12=(4x+3)(3x-7)

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Solution for 12x^2-7x-12=(4x+3)(3x-7) equation:


Simplifying
12x2 + -7x + -12 = (4x + 3)(3x + -7)

Reorder the terms:
-12 + -7x + 12x2 = (4x + 3)(3x + -7)

Reorder the terms:
-12 + -7x + 12x2 = (3 + 4x)(3x + -7)

Reorder the terms:
-12 + -7x + 12x2 = (3 + 4x)(-7 + 3x)

Multiply (3 + 4x) * (-7 + 3x)
-12 + -7x + 12x2 = (3(-7 + 3x) + 4x * (-7 + 3x))
-12 + -7x + 12x2 = ((-7 * 3 + 3x * 3) + 4x * (-7 + 3x))
-12 + -7x + 12x2 = ((-21 + 9x) + 4x * (-7 + 3x))
-12 + -7x + 12x2 = (-21 + 9x + (-7 * 4x + 3x * 4x))
-12 + -7x + 12x2 = (-21 + 9x + (-28x + 12x2))

Combine like terms: 9x + -28x = -19x
-12 + -7x + 12x2 = (-21 + -19x + 12x2)

Add '-12x2' to each side of the equation.
-12 + -7x + 12x2 + -12x2 = -21 + -19x + 12x2 + -12x2

Combine like terms: 12x2 + -12x2 = 0
-12 + -7x + 0 = -21 + -19x + 12x2 + -12x2
-12 + -7x = -21 + -19x + 12x2 + -12x2

Combine like terms: 12x2 + -12x2 = 0
-12 + -7x = -21 + -19x + 0
-12 + -7x = -21 + -19x

Solving
-12 + -7x = -21 + -19x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '19x' to each side of the equation.
-12 + -7x + 19x = -21 + -19x + 19x

Combine like terms: -7x + 19x = 12x
-12 + 12x = -21 + -19x + 19x

Combine like terms: -19x + 19x = 0
-12 + 12x = -21 + 0
-12 + 12x = -21

Add '12' to each side of the equation.
-12 + 12 + 12x = -21 + 12

Combine like terms: -12 + 12 = 0
0 + 12x = -21 + 12
12x = -21 + 12

Combine like terms: -21 + 12 = -9
12x = -9

Divide each side by '12'.
x = -0.75

Simplifying
x = -0.75

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