0.025*1.6667*x*0.4/1-0.025*1.6667*x*0.4=0.3
    7600/(112*0.12+x)+10000/(112*0.2+x)+10000/x=150
    7600/(101*0.12+x)+17500/x=150
    7600/(101*0.12+x)+17500/x=150
    15%X*15%÷15%=150÷15% X
    2/9x+2000=5/7(7/9x-2000)
    15%X*15%÷15%=150÷15%
    15%X*X÷X=150÷15%
    15%X*X÷X=150
    3.14x/5+6.21x/3=1
    3.14x/5+6.21x/3
    6x²-6x
    40*lg(x/3)=-7
    （39.402+x）×2.15＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.75＝39.402+71.604-x
    （39.402+x）×1.55＝39.402+71.604-x
    (sinx)^2+(sin(135-x))^2-(sin45)^2=sqrt(2)*sinx*sin(135-x)
    (x-110)/x=0.06
    (x-110)/x=0.06

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