2.5x+4x÷0.8-7.5 = 7.5
    2.5x+4x÷0.8-7.5 = 7.5
    2.5x+4x÷0.8-7.5 = 7.5
    w*(1+w^2) = 1
    2.5x+4x÷0.8-7.5 = 7.5
    w*(1+w)^2=1
    2.5x+4x÷0.8-7.5=7.5
    x^x=6
    x^5+5x=258
    2.5x+4x-0.8-7.5=7.5
    p^2-(1/5)p-4/5=0
    3+15p-15=3p^2
    x=!(52)
    3/4x÷2/5=15/14
    x*((1+(x^2))^0.5)*((1+(0.04*(x^2)))^0.5)=8
    0.7215x+0.3273=2.51x/（1+1.51x）
    lnx-1/x=0
    0.05x=x-119.92
    [150 ×(1-10%)-100]×40+[225(1-a%)-150]×20=2 000
    -316.8688751+log(x)*(-97.67677808)+(x^0.525475961)*316.8688751+(-68.83019856)*(x^0.525475961)*log(x)=0

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