6x^2-6x=21-x

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Solution for 6x^2-6x=21-x equation:


Simplifying
6x2 + -6x = 21 + -1x

Reorder the terms:
-6x + 6x2 = 21 + -1x

Solving
-6x + 6x2 = 21 + -1x

Solving for variable 'x'.

Reorder the terms:
-21 + -6x + x + 6x2 = 21 + -1x + -21 + x

Combine like terms: -6x + x = -5x
-21 + -5x + 6x2 = 21 + -1x + -21 + x

Reorder the terms:
-21 + -5x + 6x2 = 21 + -21 + -1x + x

Combine like terms: 21 + -21 = 0
-21 + -5x + 6x2 = 0 + -1x + x
-21 + -5x + 6x2 = -1x + x

Combine like terms: -1x + x = 0
-21 + -5x + 6x2 = 0

Factor a trinomial.
(-3 + -2x)(7 + -3x) = 0

Subproblem 1

Set the factor '(-3 + -2x)' equal to zero and attempt to solve: Simplifying -3 + -2x = 0 Solving -3 + -2x = 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 + -2x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -2x = 0 + 3 -2x = 0 + 3 Combine like terms: 0 + 3 = 3 -2x = 3 Divide each side by '-2'. x = -1.5 Simplifying x = -1.5

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

Solution

x = {-1.5, 2.333333333}

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