9.0/(36+x)=2.5/(10-x)
    9/(36+x)=2.5/(10-x)
    8.5/(36+x)=2.5/(10-x)
    （x-x/40）+400 = 8500/0.95
    25m^6+600m^4+3880m^2+576=0
    13x+12x-5/13*(5x+8)=12
    3x=1
    2x+5÷x+lnx=7
    12*6-(6+2t)/2-t*(6-2t)/2=22
    12*6-2t*6/2-(12-2t)*t/2-(6-t)*12/2=22
    (50-x)*(50+5x)=4000
    (7x+70)÷(3x+70)=7÷4
    100*（1+i)^2=121
    x^3-3x^2+3x-1=0
    x^4-x^2-8x-48=0
    x^4+7x-30=0
    x^4+4x-24=0
    x+x*0.06=574
    56×7.88+12.08c=（56+c）×7.98
    (1-sqrt2)*y*y-2*sqrt2*y+4=0

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