\(\left(19x+2.5^2\right):14=\left(138-8\right)^2-4^2\)
=> ( 19x + 2.25 ) : 14 = ( 130 )\(^2\) -16
=> 19x + 50 : 14 = 16900 -16
=> 19x + 50 : 14 = 16884
19x + 50 = 16884 . 14
19x + 50 = 236376
19x = 236376 - 50
19x = 236326
x = 236326 : 19
x = 12438