a: =>x>6-3=3
b: =>7x-3x<=-4-2
=>4x<=-6
hay x<=-3/2
c: =>4x-2x>=-5+3
=>2x>=-2
hay x>=-1
d: =>3x-2x<=3+5
=>x<=8
e: =>4x-3x>=2+5
=>x>=7
f: =>3x+x<4+8
=>4x<12
hay x<3
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