-5/6x=-7/8 what is x?

would it be 1/4? I don't know how to do this?

To get x by itself, multiply by the reciprocal of -5/6, which would be -6/5.

Whatever operation you do to one side of an equation you must do to the other side as well:

-6/5 * (-5/6)x = -6/5 * -7/8

x = 42/40 = 21/20

Let's check:
(-5/6)(21/20) = -7/8
-7/8 = -7/8

I hope this will help.