Mathematics
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    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
    1+x+x^(2)
    4x-x^(2)-3
    x^(2)-4x+3

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