(a)[2]
Expand and simplify the expression $2(3x + 2) - 4(x + 1)$.
(b)[2]
Factorise completely the expression $3y^2 - 6y$.
(c)[2]
Rewrite $a = \frac{b}{4} - 5$ with $b$ as the subject.
(d)[3]
Solve the simultaneous equations $3x + 2y = 11$ and $6x - y = 32$.