Factorise the following polynomial.

$7x+14$

Factorise the following polynomial.

$a^2+7a$

Factorise the following polynomial.

$5y-7y^2$

Factorise the following polynomial.

$8c^2-24c$

Factorise the following polynomial.

$5m^2-6m$

Factorise the following polynomial.

$12u-20uv$

Factorise the following polynomial.

$10pq-12p^{2}q$

Factorise the following polynomial.

$24d+32d^3$

Factorise the following polynomial.

$30g+54gh$