Simplifying the first equation:

X(x+4)-(x+4) = Xx + 4X - x - 4 = (X-1)x + 4X - 4

Setting the equation equal to 0:

(X-1)x + 4X - 4 = 0
=> (X-1)x = -4X + 4

Solving for X:

(x-1)x = -4X + 4
=> x^2 - x = -4X + 4
=> x^2 - x + 4X - 4 = 0

Similarly, simplifying the second equation:

a(a-3) = 2a - 6
=> a^2 - 3a = 2a - 6
=> a^2 - 3a - 2a + 6 = 0
=> a^2 - 5a + 6 = 0

For further simplification, you can use the quadratic formula to find the values of X and a.