7x^2-21x=x^2-3x

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Solution for 7x^2-21x=x^2-3x equation:


Simplifying
7x2 + -21x = x2 + -3x

Reorder the terms:
-21x + 7x2 = x2 + -3x

Reorder the terms:
-21x + 7x2 = -3x + x2

Solving
-21x + 7x2 = -3x + x2

Solving for variable 'x'.

Reorder the terms:
-21x + 3x + 7x2 + -1x2 = -3x + x2 + 3x + -1x2

Combine like terms: -21x + 3x = -18x
-18x + 7x2 + -1x2 = -3x + x2 + 3x + -1x2

Combine like terms: 7x2 + -1x2 = 6x2
-18x + 6x2 = -3x + x2 + 3x + -1x2

Reorder the terms:
-18x + 6x2 = -3x + 3x + x2 + -1x2

Combine like terms: -3x + 3x = 0
-18x + 6x2 = 0 + x2 + -1x2
-18x + 6x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-18x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '6x'.
6x(-3 + x) = 0

Ignore the factor 6.

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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