A quotient needs two quantities to be defined. In this question only one quantity is mentioned, that is, twice a number. Let's suppose that the other number for the quotient is y, then we have:
(2x/y)-2=5. We need to find x.
2x/y=7, so 2x =7y. Since we don't know y we can't find x.
Let's suppose that y was a number, for example, 4, then 2x=7×4=28. So x=28/2=14.
Now, for example, suppose y=x-5, then 2x=7(x-5)=7x-35, so 35=7x-2x=5x, and x=35/5=7.
You need to find out what the complete question was to get the required answer.