(X-10000*6%-6000*10%/(1-25%)-4000*9%)/1000=(X-10000*6%-6000*10%/0.75)/1400
    92*0.98/(92+x)=0.87
    x^4-12x^2+4=0
    1500/a*1000+1200/((8a+240)/a0*1000=150000
    Number of flights = (500,000+5,000*Number of flights+400,000)/(90*195)
    8+X-3=2
    Number of flights = (500,000+5,000*Number of flights+400,000)/(90*195*Number of flights)
    200（X-3） = 150（X+5）
    3790+78x-0.78x^(2)
    0.003x^2+29.856x-84214.66
    x-(x-800)*0.2=3416.58
    （152-x）-5=10/11x
    (X-6000*10%/(1-25%)-4000*9%)/1000=(X-6000*10%/0.75)/1400
    x-(x-800)*.2=3416.58 x=
    (EBIT-6000*10%/(1-25%)-4000*9%)/1000=(EBIT-6000*10%/0.75)/1400
    x^3-2*x+5=0
    6x^2-24x^3+30x^4-12x^5=0
    （152-x）-5=9/11x
    4a^2-20a-20=0
    -2x^(2)+x＝-1

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