algerbra

4k+mn=n-3;n solve n 3ab-2bc=12;c solve c z=(x+y/3)w;y

I don't understand your notation.
Are these 3 separate questions?

Do you mean ?

a) 4k+mn=n-3 Make n the subject

b) 3ab-2bc=12 Make c the subject

c) z=(x+y/3)w Make y the subject