Let's solve this step by step:

Multiply (х - 5,46) by 2:
2*(х - 5,46) = 9(1 2)

Simplify the equation:
2х - 10,92 = 9(12)

Multiply 9 by 12:
2х - 10,92 = 108

Now let's move on to the next part of the equation:

Add 279,48 and 105,24:
1243,5 + (279,48 + 105,24) = 1243,5 + 384,72

Calculate the sum:
1243,5 + 384,72 = 1628,22

Therefore, the final equation is:
2х - 10,92 = 108
1243,5 + 384,72 = 1628,22