118.75+82.875-0.25a=0.335*（475+195-a）
    0.5a+17.5=475*0.25
    (1/10000)x^2+(13/100)x-2=35
    （b+2）(b+2)-4(6-b)=0
    （b+2）(b+2)-4(6-b)=0
    0.0001x^2+(13/100)x-2
    x+2/x
    72x²-52x+9=0
    (30+x)(24-x)=560
    25(1-x)^2=16
    30000（10+m）+（18000+1000m）（15-m/5）=558000
    0.55x+0.15x+0.25x+0.043x+0.12x-0.125x=10
    e^x+1=x*e^x
    x*x-4.8x-6.56=0
    x(e^x-3)+3=0
    0.09*x=90*0.91
    1.5/28000=1.41/(14100+x)
    （5070000+（45.5*45.5*364/x^2））*（x-45.5*0.00004267）=45.5*8.134*373.15
    5x²+20x+20=0
    10x(x-3)=[10x+(x-3)]2/7

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