-x^2+8
    x*2.5=4.04
    x*2.5=4.04
    X÷（X+5910200）=35%
    1.5 x- 0.3=2.25
    x^4＋8x^2-49＝0
    ex÷cosx
    x/8+(x-18)/4＝12
    x/8+(x-18)/4＝12
    x/8+(x-18)/4＝12
    x/6+(x-18)/2＝12
    （155.1-x）/x=4.3
    （155.1-x）/x=4.3
    （155.1-x）/x=4.3
    （155.1-x）/x=-4.3
    (2m-3)²=36
    (m²-2m-3-m²+4m)²+(3-m-m)²=(6√2)²
    (x^2+25)(2-x)^2＝(x^2-25)^2
    (625+x^2)(2-x)^2＝(x^2-125)^2
    10.5%=1.1*（1+X）/14.4+X

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