7600/(150+x) + 27600/(210+x) = 150
    7600/(150+x) + 25200/(210+x) = 150
    X+（X/11.3）=186400
    x+(x/11.3)=174400
    x+(x/11.3)=181200
    x+(x*11.3)=181200
    1/12×x^4-288x^2+9028.3089×x-78439.4136=0
    1/12×x^3-288×x-82944/x+4711.41=0
    x^2+0.1x-0.1=0
    40=20*P*(1-5%)-60
    400000=20000*P*(1-5%)-600000
    0.7x^3+0.0024x^2+4.2812X+2188.7
    7x^3+0.0024x^2+4.2812X+2188.7
    -7x^3+0.0024x^2+4.2812X+2188.7
    0.0000005x^3+0.001x^2+4.2812x+2188.7=0
    1-x*3
    0.0000002x^3+0.001x^2+2.1756x+1211.7135=0
    5*10^（-7）X^3+0.0024X^2+4.812X+2188.7=0
    0.0000002x^-7+0.0009x^2+2.2064x+1192.1=0
    x*25/30-x*0.15=15.67

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