2^x=x^2
    2^x=x^32
    80+30X＝80+80×25％X
    80X+30X＝80X+80×28％X
    80X+30X＝80X+80×28％
    160.6×7.93+12.09x=（160.6+x）×7.97
    -25000+x-（x*0.1）=50000
    10404*x*x+321680*x+2016400=0
    10404x*10404x-321680x+2016400=0
    8x^2-6x+1=0
    8x^2+6x+1=0
    10x^2+7.5x+1.25=0
    d^3+2d^2+16d+10=0
    x^3+6x^2+9x=0
    6+x=9
    4x^3+12x^2+12x+4=0
    1/x+1/(x+3)+(2x+2)/(x^2+2x+2)=1/(x+2)
    56+x=89
    56+x=89
    89+x=6

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