21x^2=-9x

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


Simplifying
21x2 = -9x

Solving
21x2 = -9x

Solving for variable 'x'.

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

Combine like terms: -9x + 9x = 0
9x + 21x2 = 0

Factor out the Greatest Common Factor (GCF), '3x'.
3x(3 + 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 '(3 + 7x)' equal to zero and attempt to solve: Simplifying 3 + 7x = 0 Solving 3 + 7x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 7x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 7x = 0 + -3 7x = 0 + -3 Combine like terms: 0 + -3 = -3 7x = -3 Divide each side by '7'. x = -0.4285714286 Simplifying x = -0.4285714286

Solution

x = {0, -0.4285714286}

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