4x-2=3x
    1-1.5x=3x+2.5
    （1100-750-x）(30+x/50*10)=12000
    （1100-750-x）(30+x/50X10)=12000
    x^2+0.1x-0.001 = 0
    x^2+0.1x-0.01 = 0
    x^2+0.1x-0.01=0
    x2+0.1x-0.01=0
    x*(1-7%)=8440650.47
     (14)(x+800)+(14)(x+500)+7x/12+18x/12 +108x =407880-24100
    879x-x²=7402.6
    0.74*5.67*10^-8*x^4+3435.9*x = 0.74*5.67*10^-8*1173^4+3435.9*706
    0.74*5.67*10^-8*x^4+3435.9*x=0.74*5.67*10^-8*973^4+3435.9*706
    x*0.7=33.8
    x*0.7=39.8
    x＋8＝x
    15%=1-2000/（2000+x）
    15%=1-1000/(1000+x)
    10%=1-500/(500+x)
    8%=1-300/(300+x)

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