(5x+4)/3-2 = 1

To solve for x, first simplify the left side of the equation:

(5x+4)/3 - 2 = 1
(5x + 4)/3 = 3
5x + 4 = 3(3)
5x + 4 = 9
5x = 9 - 4
5x = 5
x = 1

Now plug in x = 1 into the second expression:

5x(3x - 7)
5(1)(3(1) - 7)
5(1)(3 - 7)
5(1)(-4)
-20

Therefore, when x = 1, the expression 5x(3x - 7) equals -20.