7x^2-4=21x-4

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Solution for 7x^2-4=21x-4 equation:


Simplifying
7x2 + -4 = 21x + -4

Reorder the terms:
-4 + 7x2 = 21x + -4

Reorder the terms:
-4 + 7x2 = -4 + 21x

Add '4' to each side of the equation.
-4 + 4 + 7x2 = -4 + 4 + 21x

Combine like terms: -4 + 4 = 0
0 + 7x2 = -4 + 4 + 21x
7x2 = -4 + 4 + 21x

Combine like terms: -4 + 4 = 0
7x2 = 0 + 21x
7x2 = 21x

Solving
7x2 = 21x

Solving for variable 'x'.

Reorder the terms:
-21x + 7x2 = 21x + -21x

Combine like terms: 21x + -21x = 0
-21x + 7x2 = 0

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

Ignore the factor 7.

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 + x)' equal to zero and attempt to solve: Simplifying -3 + x = 0 Solving -3 + x = 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 + x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + x = 0 + 3 x = 0 + 3 Combine like terms: 0 + 3 = 3 x = 3 Simplifying x = 3

Solution

x = {0, 3}

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