Please someone help, I don’t know how to approach the question

What is the solution of 5/2x - 7 = 3/4x + 14 ? a. x = -6 b. x = 6 c. x= 8 d. x = 12

C(x)=(2x^2+5x)/(x^3+8) what is maximum c(x)?

In regards to acetyl coa in the tca/kreb's cycle: how many cycles minimum would it take for an acetyl coa carbon to be removed? (what is the first step that this removal could happen? why can't we know for sure how many turns it takes?