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
    5550 and 1=1
    5550 and 1=2
    n^3＋n＝10
    n²＋n＝6
    X+10%X=0.7
    5x^4-(20/9)*x^2-(40/3)*x^2=20
    (x-1)/(2x+1.9)=1.5/5.5
    -1²-（1/2-2/3）÷ 1/3x[-2+（-3）²]
    a²-12a=-36
    a^3-5a-2.4=0
    lnx-1／x

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