64400+0.15x=50000+0.2x
    40000+40.96x^2-0.01x^4=0
    192/x^2=4*(1/(x-4)+3/x)*(16/x-1)
    192/x^2=4*(1/(x-4)+3)*(16/x-1)
    290+x=720
    （3sqrt（3）－x）^(2)
    4/5x - 10 + 50 = (x-10) * 3/4
    0.01x^4+x^2-100=0
    4x^3+9x^2-13=0
    156÷（x-3）=12
    (5/4)*(100-88.899636)+88.899636
    100*1.04^-3
    125-25*1.04^-3
    100+100*0.01*(1-1.04^-3)/0.04
    x^2-4.4x+3.6=0
    5000000000000 = 150*1000*(1525*0.000001-30.5*1000000*x)
    5000000000 = 150*1000*(1525*0.000001-30.5*1000000*x)
    5*(1-1.04^-3)/0.04+100*1.04^-3
    50*(1-1.06^-5)/0.06+1000*1.06^-5
    5000000=150*1000*(1525*0.000001-30.5*1000000*x)

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