x²-53x=196
    x²-53x=196
    1/2×x×4X=12
    1/2×x×4X=12
    (7+x)x(8-x)＝50
    49.9×a×0.52=18.9
    35.6×a×0.52=13.8
    2x+2x-1+2x-2+2x-3+2x-4+2x-5+2x-6+2x-7+2x-8+2x-9-x＝230
    399+30x=100+109x
    399+30x=100+109x
    x-x/1.09*3% =767837.49
    √2sinx
    7.34+x=40.8
    ln(0.053+sqrt(0.053*0.053+1)=a
    （85-83）*（100-x）=（98-85）*（x-86）
    [200+20*(60-x)]*(x-40)
    V=8581+80+259.83+0.01V+380.59+0.0002V+558.09+0.0006V+0.0538V
    [200+20*(60-x)]*(x-40)=0
    V=8581+80+259.83+0.01V+380.59+0.0002V+558.09+0.0006V+0.0538V
    [200+20*(60-x)]*(x-40)=0

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