Calcula el valor de x en el triángulo que se muestra abajo.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

the one where 1 and 2 are directly across from each other.  

see image