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    2x+3(13-x)=21
    -xx+12x=37
    (2-x)(1-x)(-x)-8=0
    100000=2020x+3.85x^0.4
    X^5-4*x^4+5*x^3-6*x^2-2*x+3=0
    求齐次线性方程组x1+2x3-x4=0 -x1+x2-3x3+2x4=0
    (1+x)^22-1.9535=0
    (1+x)^17-1.6495=0
    (1+x)^12-1.392=0
    (1+x)^7-1.173=0
    x:20.7=2:1.8
    (22.2-x)/x=-0.284
    (x-9)/(10.2-9.5)=(8-7)/(12-11)
    (1+x)^36-3.23=0
    (121.7-x)/x=-0.249
    (1+x)^26-2.23=0
    (1+x)^16-1.59=0
    x+3=5
    1-x^9=0.9
    15x=105

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