5x^2+28x=12x-3x^2+42

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Solution for 5x^2+28x=12x-3x^2+42 equation:


Simplifying
5x2 + 28x = 12x + -3x2 + 42

Reorder the terms:
28x + 5x2 = 12x + -3x2 + 42

Reorder the terms:
28x + 5x2 = 42 + 12x + -3x2

Solving
28x + 5x2 = 42 + 12x + -3x2

Solving for variable 'x'.

Reorder the terms:
-42 + 28x + -12x + 5x2 + 3x2 = 42 + 12x + -3x2 + -42 + -12x + 3x2

Combine like terms: 28x + -12x = 16x
-42 + 16x + 5x2 + 3x2 = 42 + 12x + -3x2 + -42 + -12x + 3x2

Combine like terms: 5x2 + 3x2 = 8x2
-42 + 16x + 8x2 = 42 + 12x + -3x2 + -42 + -12x + 3x2

Reorder the terms:
-42 + 16x + 8x2 = 42 + -42 + 12x + -12x + -3x2 + 3x2

Combine like terms: 42 + -42 = 0
-42 + 16x + 8x2 = 0 + 12x + -12x + -3x2 + 3x2
-42 + 16x + 8x2 = 12x + -12x + -3x2 + 3x2

Combine like terms: 12x + -12x = 0
-42 + 16x + 8x2 = 0 + -3x2 + 3x2
-42 + 16x + 8x2 = -3x2 + 3x2

Combine like terms: -3x2 + 3x2 = 0
-42 + 16x + 8x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-21 + 8x + 4x2) = 0

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

Ignore the factor 2.

Subproblem 1

Set the factor '(-7 + -2x)' equal to zero and attempt to solve: Simplifying -7 + -2x = 0 Solving -7 + -2x = 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 + -2x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -2x = 0 + 7 -2x = 0 + 7 Combine like terms: 0 + 7 = 7 -2x = 7 Divide each side by '-2'. x = -3.5 Simplifying x = -3.5

Subproblem 2

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

Solution

x = {-3.5, 1.5}

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