a: \(\Leftrightarrow x-5-2\left(2x-1\right)< 12\)
=>x-5-4x+2<12
=>-3x-3<12
=>-3x<15
hay x>-5
b: \(\Leftrightarrow4\left(5x^2-3\right)+5\left(3x-1\right)>10x\left(2x+3\right)-100\)
\(\Leftrightarrow20x^2-12+15x-5-20x^2-30x+100>0\)
=>-15x+83>0
hay x<83/15