5) Calcula el valor de la incógnita mediante el despeje en ro ecuación $$ 12 x^{2}+3-30=21 $$

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Solve the equation $$ 12x^2+3-30=21 $$.
Solve the quadratic equation by following steps:
- step0: Solve using square roots:
  $$12x^{2}+3-30=21$$
- step1: Subtract the numbers:
  $$12x^{2}-27=21$$
- step2: Add or subtract both sides:
  $$12x^{2}=48$$
- step3: Divide both sides:
  $$\frac{12x^{2}}{12}=\frac{48}{12}$$
- step4: Divide the numbers:
  $$x^{2}=4$$
- step5: Simplify the expression:
  $$x=\pm \sqrt{4}$$
- step6: Simplify the expression:
  $$x=\pm 2$$
- step7: Separate into possible cases:
  $$\begin{align}&x=2\&x=-2\end{align}$$
- step8: Rewrite:
  $$x_{1}=-2,x_{2}=2$$
El valor de la incógnita $$x$$ en la ecuación $$12x^{2}+3-30=21$$ es $$x=-2$$ o $$x=2$$.
The value of the unknown $$x$$ is $$x=-2$$ or $$x=2$$.

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