（（90-x）-30）/ln（（90-x）/30）＝44.75
    3(x-2)+1=x-(2x-1)
    2(X+3)-5+5x=3(x-1)
    180000000=14.3*250x（515-x/2）
    1.69=5.88x+60x^2
    100x/(1-x)=80.48505715
    100x/(1-x)=70.48505715
    100x/(1-x)=50.48505715
    26000x^2=2407.5+735x
    60-4P=-20+6P
    100x/(1-x)=31.48505715
    4*d^3+12*d^2+12*d+4=0
    d^4+4*d^3+6*d^2+4*d=1
    d^4+4*d^3+6*d^2+4*d=1
    100x/(1-x)=18.22264811
    2*d^2+15*d+24=0
    -760x^2+169.1x=1
    X/3
    2*d^2+3*d+6=0
    2*d^2+3*d+6=0

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