you cannot get that answer.... when you divide. Put the number into a fraction first so, it makes it easier to see what you are doing. So,

.Now simplify the cross off the zero from the top and the bottom to get

. So,

will give you 0.83333333333...3.
Answer:
x must be greater than -53/14
(im not 100% sure but i think this is correct)
First subtract 30-23 that’d be the value of UV(7) now subtract 18 from 7, the answer will be 11 therefore TU is 11.
Add 10 to both sides. X is 2. A.