xxxx+4xx-4x-3=0
    x^2+9x=-81
    0.0002*X*X+0.0004*X-0.00004=0
    4+3.6x=12.1
    0.0002*X*X+0.0004*X-0.00005=0
    3x+2(x-2.5）=27.5
    0.0002*X*X+0.001*X-0.00003=0
    −0.4854x^2+1.8598x−0.0268=0
    0.0003*X*X+0.0003*X-0.00001=0
    (1-x)^3-0.7219(1-x)+1.98450=0
    0.0003*X*X+0.0003*X-0.000008=0
    0.6*（2X+150）-63=88+X
    3/4x＝21
    0.0003*X*X+0.0004*X-0.000005=0
    -0.00000001642*x^3 + 0.00005571*x^2 -0.07231*x + 66.2=49.6
    x^2-2x-4=0
    3x+2×(x－2.5）=27.5
    -1.642e-08*x^3 + 5.571e-05*x^2 -0.07231*x + 66.2=49.6
    0.0003*X*X+0.0003*X-0.000002=0
    0.0002*X*X+0.0004*X-0.000006=0

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