We have

And we want

Another way to read it is

It should be clear that the solution is 
Answer:
x=-2.5
Step-by-step explanation:
2x-10÷4=3x
2x-2.5=3x
-2.5=x
Answer:
The correct options are (1), (3) and (5).
Step-by-step explanation:
The two triangles are shown below.
The measure of ∠F corresponds to ∠F'.
The distance between the points D and origin is of 9 units.
And the distance between the points D' and origin is 3 units.
Thus, the distance from point D' to the origin is One-third the distance of point D to the origin.
Check for similarity:

Thus, the △DEF is similar to △D'E'F'.
Thus, the correct options are (1), (3) and (5).