Mathematics
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    -200x^2+8800x-87000+200x-5800≥7200
    100x+80*(50-x)<=4300
    2*x^2-5*x-25<=0
    x*x-175x+10000<0
    (60-x-40)(300+40x)≥6240
    0.7^x<0.01
    (2x+1)/4<=(x-1)/3
    (9225+95x)/(117+x)>=80
    (9225+90x)/(117+x)>=80
    (9225+85x)/(117+x)>=80
    (9225+85x)/(117+x)>=85
    (9225+85x)/(117+x)>=90
    1079235+85x^2+(9225+117*85)x>=0
    -3/10
    
t+1/t>5
    16a ²+16a>0
    16a ²+15a>0
    a²-a+2>0
    -3<2*x➕4≤10
    4x^2➕7<12

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