If 5^{x + 1} = 25^{x - 2}; find the value of :

3^{x - 3} × 2^{3 - x}.

If 4^{x + 3} = 112 + 8 × 4^x; find (18x)^3x.

Solve for x :

(a^{3x + 5})².(a^x)⁴ = a^{8x + 12}