please answer these question I will mark brainliest please only do part c and f
![please answer these question I will mark brainliest please only do part c and f class=](https://us-static.z-dn.net/files/dfc/dbafeab904ac0c44c7372f328e84d65b.jpg)
Answer:
c.15+2z/6x-12y
f.7a+b/4a-6b
Step-by-step explanation:
z+1/x-2y - 2x-3/2x-4y + z/3x-6y
z+1/x-2y - 2x-3/2(x-2y) + z/3(x-2y)
6(z+1)-3(2z-3)+2z
15+2z/6x-12y
3a/2a-3b - a+b/2(-3b+2a)
6a+a+b/2(2a-3b)
7a+b/4a-6b