(3x+7)(x-21)x=0

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Solution for (3x+7)(x-21)x=0 equation: 


Simplifying
(3x + 7)(x + -21) * x = 0

Reorder the terms:
(7 + 3x)(x + -21) * x = 0

Reorder the terms:
(7 + 3x)(-21 + x) * x = 0

Reorder the terms for easier multiplication:
x(7 + 3x)(-21 + x) = 0

Multiply (7 + 3x) * (-21 + x)
x(7(-21 + x) + 3x * (-21 + x)) = 0
x((-21 * 7 + x * 7) + 3x * (-21 + x)) = 0
x((-147 + 7x) + 3x * (-21 + x)) = 0
x(-147 + 7x + (-21 * 3x + x * 3x)) = 0
x(-147 + 7x + (-63x + 3x2)) = 0

Combine like terms: 7x + -63x = -56x
x(-147 + -56x + 3x2) = 0
(-147 * x + -56x * x + 3x2 * x) = 0
(-147x + -56x2 + 3x3) = 0

Solving
-147x + -56x2 + 3x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.
x(-147 + -56x + 3x2) = 0

Factor a trinomial.
x((-7 + -3x)(21 + -1x)) = 0


Subproblem 1
Set the factor 'x' equal to zero and attempt to solve:

Simplifying
x = 0

Solving
x = 0

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

Simplifying
x = 0

Subproblem 2
Set the factor '(-7 + -3x)' equal to zero and attempt to solve:

Simplifying
-7 + -3x = 0

Solving
-7 + -3x = 0

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

Add '7' to each side of the equation.
-7 + 7 + -3x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -3x = 0 + 7
-3x = 0 + 7

Combine like terms: 0 + 7 = 7
-3x = 7

Divide each side by '-3'.
x = -2.333333333

Simplifying
x = -2.333333333

Subproblem 3
Set the factor '(21 + -1x)' equal to zero and attempt to solve:

Simplifying
21 + -1x = 0

Solving
21 + -1x = 0

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

Add '-21' to each side of the equation.
21 + -21 + -1x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -1x = 0 + -21
-1x = 0 + -21

Combine like terms: 0 + -21 = -21
-1x = -21

Divide each side by '-1'.
x = 21

Simplifying
x = 21
Solution
x = {0, -2.333333333, 21}

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