x*2*0.75=33.8
    (x*2)/3=33.8
    25x*x+20x+4=0
    y^3+y=2
    5x*x+x=7
    x^-5
    x(x-3)+5=0
    1000x+1=（1+x）^30
    1+x=2
    9*x*x+6x+1/9=0
    2-1/x
    x*x-9/2x+4=0
    578x/2080=28-x
    (100/10^6-x)*(100/10^6-x+0.9699)÷(0.03-100/10^6+x)÷x=4.7*10^5
    y*y+0.09=0.6y
    （100/10^6-x）*（100/10^6-x+0.9699）÷（0.03-（100/10^6-x））÷x=4.7*10^5
    1/x-2
    4(y 2+0.09)=2.4y
    4x(x-1)+3=0
    x∧2－900x＋160000＝0

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