Mathematics
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    -1600<-40x -40x<-1500
    2a+1>0 2a-3<0
    2x>-3 x-1<8-2x
    135/8 145/8
    75<5y-3(20-y) 5y-3(20-y)<85
    4.7=x/(60+x)
    20>(x/0.9)
    6x+0*1-2(15-x)>60
    60%x+81*40%>90
    60%x=60
    x-(x*0.0053)=5173
    x-880.42=x*0.86%
    (-x)^(2)+2
    (-x)^(2)
    x^3-9x^2+6x+4=0
    2^2
    2/1(x+1)<3/2x-1
    1-a<0
    (1-a)<1
    x^(2)+x+1

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