x=2000x-4000
    40x=2+50x
    x^2-35x+300=0
    (x-100)(1000-2x)-40000=32800
    x^2-600+86400=0
    4/x
    X+(X+31)=311
    2^x+x
    X+(X+31)=311
    24x=20（33-x）
    30÷2X=3
    x（x+8)=65
    2x^3-3x^2+1=0
    （X -11）*50000-67500-5000*X*5%=103550
    （X -11）*50000-67500-5000*X*5%=103550
    Y=100+0.9Y+50
    100+0.9Y+50
    =100+0.9Y+50
     (1+1/y)^30-1^ 30 =66.4/y
     y(1+1/y)^30-y = 66.4

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