a: \(\left(2x+3\right)\left(2x-1\right)>4x\left(x+2\right)\)
\(\Leftrightarrow4x^2-2x+6x-3>4x^2+8x\)
=>2x-3>8x
=>-6x>3
hay x<-1/2
b: \(\Leftrightarrow5x-5-7x+x^2< x^2\)
=>-2x<5
hay x>-5/2
c: \(\Leftrightarrow x^2-2x+1+x^2-6x+9>x^2+x^2+2x+1\)
=>-8x+10>2x+1
=>-10x>-9
hay x<9/10