xxx-3xx-9x-5=0
    x^2=3x-1
    x*e^(x+1)-1=0
    105=(n+1)/2×n
    960x=1350(x-3)-3750
    3x-91=1/3(91-x)-x
    3x-91=1/3(91-x)-1
    20000-x=126500/13
    104.4x=103.6(20000-x)
    x+3÷x
    x+x÷3
    n*(n+1)=1000000000
    4899xx-1077780x-12900000=0
    x-1
    0.295t+0.1751=88157.674*t^6
    e^x*5+8x=ln3x*x^3
    x^7+4x^4+16x^3-200x-10=0
    0=4.04-144159t^3-26.36t
     3x^2-4x-1=0
    X+X*0.13=4688

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