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    2X^2+130X-3793=0
    1000*(X-180)=1500*(X-500)
    0.0313÷x=0.1289÷0.86289
    0.4÷100.58=x÷7.86
    sinx=0.5
    1*174+x*80=(1+x)*160
    99×h÷2
    99X÷2
    4x^2-4=x^3+x^2
    (3x^2)/4+(x/2-(5-x))^2=7
    (3x^2)/4+(x/2+(5-x))^2=7
    a(a+1)=300
    (x-40)(140-2x)=800
    x²+xsinx
    x×x-110x+2600=0
    2942.828*3.1415926*0.00636*(45-x)^0.75 = 65*0.451*(x-32.5)
    2942.828*3.1415926*0.00636*(45-x)^0.75 = 59*0.451*(x-32.5)
    ln3x
    (2m-1)(2m-1)-4m×m=2
    3/2×(1.56^(1-x)-1.69^(1-x))=1.69^(1-x)-1.89^(1-x)

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