x+arctanx＝π/2
    x^3+x=1
    2X÷7=6
    4.4X-X=68
    X=68÷（4.4-1）
    68÷（4.4-1）=X
    1194.222x^4-6400x^2+6400=0
    7x－36+4x－45/0.5＝810
    tanx=0.2
    525cos20=527cosx
    2xx-15000=-sqrt2*x
    -1.1003=(1/x)*ln(1-x)
    -1.0898=(1/x)*ln(1-x)
    -1.0578=(1/x)*ln(1-x)
    7x+(2x+40)=760
    x（x/4+1）（x/36+1）=225
    -100X-20X=-24000
    20517003.44-(X/1.11*0.02)-75587.55-16879269.1=X
    (24000-X)/X*100%=20%
    240000-X/X=20%

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