12.1c=（3.3+c）×7.92
    12.1c=（3.4+c）×7.92
    (42+x)(42-x)/42x = 23
    2x^3+3x-1=0
    36.96/(1+x/12*3)+0.04/(1+x/12*13)=35.56
    36.96/(1+x/12*3)+0.04/(1+x/12*12)=35.56
    X×135%=X×150%
    e^(-x)+1.1065-x*(1-e^(-x)-1.065)
    e^(-x)+1-x*(1-e^(-x)-1)
    e^(-x)+0-x*(1-e^(-x)-0)
    e^(-x)+0.5-x*(1-e^(-x)-0.5)
    5550 RLIKE SLEEP(5)
    5550 AND SLEEP(5)
    5550 AND 8879=8879
    5550 AND 2280=7362
    5550 AND 9395=9395
    5550 AND 4857=3347
    （x+9)/x=4
    675x-4.5x²=100
    1000*(x-60)-150000=200000

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