I'm sorry, but that is not the correct solution to the given equations.
Let's simplify each equation separately:
3x + 2x + 7x = (4/2^2)
Combining like terms on the left side, we get:
12x = 1
Dividing both sides by 12, we find:
x = 1/12
Now let's simplify the second equation:
23x + 2x + 4x = (4/42^2)
Combining like terms on the left side, we get:
29x = 1/7056
Dividing both sides by 29, we find:
x = 1/(29*7056)
So the solution for x is not 14.72. It is actually a much smaller decimal fraction, approximately 0.000001169.