39=3x^2-9

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Solution for 39=3x^2-9 equation:


Simplifying
39 = 3x2 + -9

Reorder the terms:
39 = -9 + 3x2

Solving
39 = -9 + 3x2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3x2' to each side of the equation.
39 + -3x2 = -9 + 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
39 + -3x2 = -9 + 0
39 + -3x2 = -9

Add '-39' to each side of the equation.
39 + -39 + -3x2 = -9 + -39

Combine like terms: 39 + -39 = 0
0 + -3x2 = -9 + -39
-3x2 = -9 + -39

Combine like terms: -9 + -39 = -48
-3x2 = -48

Divide each side by '-3'.
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}

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