5x^2+3x-21=6-3x

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Solution for 5x^2+3x-21=6-3x equation:


Simplifying
5x2 + 3x + -21 = 6 + -3x

Reorder the terms:
-21 + 3x + 5x2 = 6 + -3x

Solving
-21 + 3x + 5x2 = 6 + -3x

Solving for variable 'x'.

Reorder the terms:
-21 + -6 + 3x + 3x + 5x2 = 6 + -3x + -6 + 3x

Combine like terms: -21 + -6 = -27
-27 + 3x + 3x + 5x2 = 6 + -3x + -6 + 3x

Combine like terms: 3x + 3x = 6x
-27 + 6x + 5x2 = 6 + -3x + -6 + 3x

Reorder the terms:
-27 + 6x + 5x2 = 6 + -6 + -3x + 3x

Combine like terms: 6 + -6 = 0
-27 + 6x + 5x2 = 0 + -3x + 3x
-27 + 6x + 5x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-27 + 6x + 5x2 = 0

Factor a trinomial.
(-3 + -1x)(9 + -5x) = 0

Subproblem 1

Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 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 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3

Subproblem 2

Set the factor '(9 + -5x)' equal to zero and attempt to solve: Simplifying 9 + -5x = 0 Solving 9 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -5x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -5x = 0 + -9 -5x = 0 + -9 Combine like terms: 0 + -9 = -9 -5x = -9 Divide each side by '-5'. x = 1.8 Simplifying x = 1.8

Solution

x = {-3, 1.8}

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