No they are not, 6/8 could also be represented as 3/4. Therefore they are not equivalent. You would divide each side by the factor they have in common such as 2.
Given:
4x + 7 = 23
Let's solve for x.
First Step:
Subtract 7 from both sides
4x + 7 - 7 = 23 - 7
4x = 16
Next Step:
DIvide both sides by 4

ANSWER:
x = 4
I think the problem is work this way because y is equal to 72 and x is 3 you just multiply 72(3)2=432
Neither, you just multiply the numerators to get 1, then multiply the denominators to get 6. It is 1/6