4x(x-2)=(2x+1)(2x-3)
in the first expression distribute the 4x, in the second expression FOIL
4x²-8x=4x²-6x+2x-3
combine like terms
4x²-8x=4x²-4x-3
subtract 4x² from each side
-8x=-4x-3
add 8x to each side
0=4x-3
add 3 to each side
3=4x
divide by 4 on each side
x= 3/4 or 0.75