5-3x<20
    180(3/2a+5)+480a≤21300
    41^2×x^2-（x^2+1）(49x^2+256)≤0
    -900+x-x*0.02≥1000
    (1-x^2)^2+(0.45x)^2-0.81<0
    x^4-1.1x^2+0.19<0
    4x+4<7x+13 3x-24>3x-12
     3x+1/2-1 ≥x
    3(X-2)<8-(X+6) 3X+3<2(2X-1)+6
    2X+1>3 4+X<7
    2sqrt(2)x+6sqrt2>3x
    5x-2<6x+1
    -41800+30000+X-X*10%/4-4500 >3000
    3x+2≥6x-9
    x-550-(1000×6%/12+1500×8%/12+x×6%/12) ≥50
    x-550-(1000×6%/12+1500×8%/12+x×6%/12)≥50
    -11200 + X - ( 10 % * X / 4 ) ≥100
    -11200 + X - ( 10 % * X / 4 ) ＞100
    -11200+X-(10%*X/4)>100
    x3>

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