a: =>-5x-2x<=6-1
=>-7x<=5
=>x>=-5/7
b: =>5(x-2)>3(7x+9)
=>5x-10>21x+27
=>-16x>37
=>x<-37/16
c: 3x+5=2x-4
=>3x-2x=-4-5
=>x=-9
d: =>4(5-12x)<4x-2
=>20-48x<4x-2
=>-52x<-22
=>x>11/26
e: =>2x<=2
=>x<=1
g: =>3x+6-1>2x-6+4
=>3x+5>2x+2
=>x>-3
h: =>6(x+4)+3(3x+2)<10x-10
=>6x+24+9x+6<10x-10
=>15x+30<10x-10
=>5x<-40
=>x<-8
l: =>(4x-1)(x-4)<0
=>1/4<x<4