184250*[1-(1-0.1)*7/x]=148321.25
    184250*[1-(1-x)*7/30]=148321.25
    184250-184250*（1-x）*7/30 = 148321.25
    84250-184250*（1-x）*7/30 = 148321.25
    184250-184250*（1-0.1）*7/x=148321.25
    2.28/（1+r)+2.6/(1+r)^2+2.81/(r-8%)/(1+r)^2=24.9
    10570.15=（220*63-x）*0.95
    0.064/X＝0.1289/0.86289
    0.4/100.58＝X/16.1
    2(216/x^2-72)^0.5=6x-9
    (250×(1-5%)-(112.5-12.5))×Q-15000=720000
    (250×(1-5%)-(112.5-12.5))×Q=720,000
    (250×(1-5%)-(112.5-12.5))×Q=720000
    (250×(1-5%)-112.5)×Q-15000= 660000
    ((250-x)-(112.5-12.5))×4800=660000
    3x+5(42-x)=150
    x+0.09x=512078.4
    x+0.09x=507326.4
    0.5x^2-186x=17676
    5x+30-85=3x+85

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