21x^2-9x=3x

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Solution for 21x^2-9x=3x equation:


Simplifying
21x2 + -9x = 3x

Reorder the terms:
-9x + 21x2 = 3x

Solving
-9x + 21x2 = 3x

Solving for variable 'x'.

Reorder the terms:
-9x + -3x + 21x2 = 3x + -3x

Combine like terms: -9x + -3x = -12x
-12x + 21x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-12x + 21x2 = 0

Factor out the Greatest Common Factor (GCF), '3x'.
3x(-4 + 7x) = 0

Ignore the factor 3.

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 '(-4 + 7x)' equal to zero and attempt to solve: Simplifying -4 + 7x = 0 Solving -4 + 7x = 0 Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 7x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 7x = 0 + 4 7x = 0 + 4 Combine like terms: 0 + 4 = 4 7x = 4 Divide each side by '7'. x = 0.5714285714 Simplifying x = 0.5714285714

Solution

x = {0, 0.5714285714}

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