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    2^(m+39)=-(m+21.41)*ln2
    x/lnx
    10÷x=12÷(x+2)+0.5
    x(2x-3)=2
    1+a%÷1-2%=1-6%
    -5x²+180x+800=1440
    x-0.6+0.0968*exp(0.2*x)-0.0231/x+(0.0231/x)*exp(0.15*x)=0
    (20-x)(100+20x)=3000
    e^cosx
    (x-4)(x-3)(x-2)
    -2.9t²+3t=0.78
    -2.9t²+3t=0.78
    q^2=(-5+sqrt(21))/2
    0.3/2.5=x/5
    3.6:4.8=x:7.2
    7:x=3:15x
    2.182=lnx
    X^2-X=15750
    (112%-36%)×5000×g-5000×(1+g)×8%×(1-50%)
    (112%-36%)×5000×g-5000×(1+g)×8%×(1-50%)=0

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