0.647=lnB-0.535*ln35
    ln(x/5+x^2)
    0.437=lnB-0.535*ln50
    ^(x/5+x^2)
    200/X=200/x+0.6*4
    x^2-23.71x+1.3225=0
    X＋80%=7.2
    2/3X÷16=7/8
    2/3X÷16=7/8
    3Q^2-120Q=-435
    3Q^2-120Q=-435
    3Q^2-120Q=-435
    x^3-5x+6=0
    x^2-5x+6=0
    x^4-5x+6=0
    x^4+3x^3-5x+6=0
    x^4-2x^3-6x^2-2x-7＝0
    X/(X+100)
    2(x+5)=50+88.4+242-2x
    ㏑x-1/2+1/2x²

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