X^2-4x-21=(x-3)

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Solution for X^2-4x-21=(x-3) equation:


Simplifying
X2 + -4x + -21 = (x + -3)

Reorder the terms:
-21 + X2 + -4x = (x + -3)

Reorder the terms:
-21 + X2 + -4x = (-3 + x)

Remove parenthesis around (-3 + x)
-21 + X2 + -4x = -3 + x

Solving
-21 + X2 + -4x = -3 + x

Solving for variable 'X'.

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

Add '21' to each side of the equation.
-21 + X2 + 21 + -4x = -3 + 21 + x

Reorder the terms:
-21 + 21 + X2 + -4x = -3 + 21 + x

Combine like terms: -21 + 21 = 0
0 + X2 + -4x = -3 + 21 + x
X2 + -4x = -3 + 21 + x

Combine like terms: -3 + 21 = 18
X2 + -4x = 18 + x

Add '4x' to each side of the equation.
X2 + -4x + 4x = 18 + x + 4x

Combine like terms: -4x + 4x = 0
X2 + 0 = 18 + x + 4x
X2 = 18 + x + 4x

Combine like terms: x + 4x = 5x
X2 = 18 + 5x

Simplifying
X2 = 18 + 5x

Reorder the terms:
-18 + X2 + -5x = 18 + 5x + -18 + -5x

Reorder the terms:
-18 + X2 + -5x = 18 + -18 + 5x + -5x

Combine like terms: 18 + -18 = 0
-18 + X2 + -5x = 0 + 5x + -5x
-18 + X2 + -5x = 5x + -5x

Combine like terms: 5x + -5x = 0
-18 + X2 + -5x = 0

The solution to this equation could not be determined.

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