15.7*x*x*x+0.1*x*x=6.8*10*-11
    -4/3x+4=3/4x-3
    x+1.4136*cos(x)-1.3998
    x-86-2x/15>0
    -(x-1)^2-2x+2=0
    -(x-1)^4-2x+2=0
    (x-1)^4-2x+2=0
    3absX+2<7
    X/2/24-2=X/2/56
    3/4absX+2<3
    2absX-3>1
    1/3absX-1>5
    (x-3)(x-3)(x-9)+8-4(x-3)-(x-9)-4(x-3)=0
    abs(2/3x+1)>2
    abs(3x-1)<5
    a^2+100*a-20625=0
    a^
    abs(2x-3)<5
    abs(1/2X-2)<3
    x（x+3）（x-1）-12x+(x-3)-2(x-1)(x-3)-2x^2+3(x+3)=0

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