Respuesta :

ddrmota05

Answer:

A. 30

Step-by-step explanation:

X+40=3X-20

-X. -X

-----------------

40=2X-20

+20. +20

-------------------

60=2X

--- ---

2. 2

30=X

the periods don't matter, don't write them down.
Is that the Geometry or what subject is it ?