x-（-33.5%）/-17.7-x
    x=30-2*((x/2-2)^2)
    x=30-10*(0.2*(x/2-2)^2)
    x=30-10*(0.2*(x/2-2)^2+x/2000)
    x-1=3
    x(0. 05+x)÷(0. 35-x)=0. 625
    x^2-x+5=0
    x(0. 1+x)÷(0. 35-x)=0. 625
    x(0. 1-x)÷(0. 35-x)=0. 625
    15x^2-21x+35=0
    15x2-21x+35=0
    arctanx+arctanx/2=90
    x^2/3(2-x)^1/3
    -19xx+975x-7850=4000
    x^3+x^2+x
    0.003x∧2－62x＋100000＝0
    (x-2)/√(x+2)
    0.003x∧2＋62x－100000＝0
    2x²-5x-1=0
    3x²＋1=4x

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