a: =>3x<-4
=>x<-4/3
b: =>2x<=5
=>x<=5/2
c: =>\(4\left(5x^2-3\right)+5\left(3x-1\right)< 10x\left(2x+3\right)-100\)
=>\(20x^2-12+15x-5< 20x^2+30x-100\)
=>15x-17<30x-100
=>-15x<-83
=>x>83/15
d \(\Leftrightarrow10x+5\left(2x+1\right)>30x-2\)
=>20x+5>30x-2
=>-10x>-7
=>x<7/10
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