21-21x=(5x+4)(x-1)

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Solution for 21-21x=(5x+4)(x-1) equation: 


Simplifying
21 + -21x = (5x + 4)(x + -1)

Reorder the terms:
21 + -21x = (4 + 5x)(x + -1)

Reorder the terms:
21 + -21x = (4 + 5x)(-1 + x)

Multiply (4 + 5x) * (-1 + x)
21 + -21x = (4(-1 + x) + 5x * (-1 + x))
21 + -21x = ((-1 * 4 + x * 4) + 5x * (-1 + x))
21 + -21x = ((-4 + 4x) + 5x * (-1 + x))
21 + -21x = (-4 + 4x + (-1 * 5x + x * 5x))
21 + -21x = (-4 + 4x + (-5x + 5x2))

Combine like terms: 4x + -5x = -1x
21 + -21x = (-4 + -1x + 5x2)

Solving
21 + -21x = -4 + -1x + 5x2

Solving for variable 'x'.

Reorder the terms:
21 + 4 + -21x + x + -5x2 = -4 + -1x + 5x2 + 4 + x + -5x2

Combine like terms: 21 + 4 = 25
25 + -21x + x + -5x2 = -4 + -1x + 5x2 + 4 + x + -5x2

Combine like terms: -21x + x = -20x
25 + -20x + -5x2 = -4 + -1x + 5x2 + 4 + x + -5x2

Reorder the terms:
25 + -20x + -5x2 = -4 + 4 + -1x + x + 5x2 + -5x2

Combine like terms: -4 + 4 = 0
25 + -20x + -5x2 = 0 + -1x + x + 5x2 + -5x2
25 + -20x + -5x2 = -1x + x + 5x2 + -5x2

Combine like terms: -1x + x = 0
25 + -20x + -5x2 = 0 + 5x2 + -5x2
25 + -20x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
25 + -20x + -5x2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(5 + -4x + -1x2) = 0

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

Ignore the factor 5.

Subproblem 1
Set the factor '(1 + -1x)' equal to zero and attempt to solve:

Simplifying
1 + -1x = 0

Solving
1 + -1x = 0

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

Add '-1' to each side of the equation.
1 + -1 + -1x = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -1x = 0 + -1
-1x = 0 + -1

Combine like terms: 0 + -1 = -1
-1x = -1

Divide each side by '-1'.
x = 1

Simplifying
x = 1

Subproblem 2
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 = -5
Solution
x = {1, -5}

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