x+((x/21.75)/8*2.5*22*1.5)+((x/21.75)/8*10.5*2*8)+(x/21.75)/8*10.5*3=5800
    x+(x/20.83)*2*5 = 4000
    x+((x/21.75)/8*2.5*22*1.5)+((x/21.75)/8*10.5*2*8)+(x/21.75)/8*10.5*3=5800
    x+(x/20.83)*2*5=4000
    （3x+2）(x+3)=x+14
    6×(（1+X)^5-1)=11311÷X
    6*(（1+X)^5-1)=11311/X
    x^6+5x^5+10x^4+10x^3+5x^2=1885.1666667
    800X=570X+10X+1500
    X-0.6%X-X/1.03*0.03*1.1-0.0003X=122533.33
    3×s^2+8*s+3=0
    3×s^2+8*s+7=0
    3×s^2+8*s+7
    649.46x - 0.0329=10
    3s^2+8*s+7
    649.46x - 0.0329=4
    (4500-6500)/6500/(p-2000)/2000=-2
    ( p − 2000 ) ÷ 2000
    (p-2000)/2000=-2
    0.3/(2000-p)/2000=-2

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