0.23x+x=10
    x.2|3
    x*x*x-7*x+4=0
    a1+a2=5 a3+a4=7 a1+a3=7 a2+a4=5
    640（x+1）^2=1000
    640（x+1）^2=1000
    8-(3x)²/2=16+x²
    (58-x)/ln((90-x)/32)=45
    x（1-20%）+x=x100%
    0.8x+x=1x
    0.8x+x=x
    X^2-9 x-18=0
    X^2-9 x+18=0
    1/x（x+1）+1/（x+1）（x+2）+1/（x+2）（x+3）=1/x+3
    X^2-9x-9=0
    43.75x^2+5x-4500
    1/x-4-1/x-5=1/x-7-1/x-8
    1/x-4-1/x-5
    33*（1-x^11）/（1-x）=412
    3.74*（1-x^17）/（1-x）=175.8

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