x/5=1
    40000 = x^2(0.04x^2+1)((0.0625x)^2+1)
    150000x^2-160000x^4=2500-10000x
    (25-2x)(40-2x)＝450
    500-45
    150000x^(2)-160000x^4=2500-10000x
    arctan67
    3.35x^2+0.069x=0.3755
    e^{-x}+x^2-6x
    90+arctan(3.75)-arctan(7.5)-arctan(0.035*7.5) = x
    90+arctan(1.5)-arctan(7.5)-arctan(0.035*7.5)=x
    5^x+1=489
    (-66.7-(29.4-x))/(ln66.7-ln(x-29.4))=-15.56
    3+3x+x^(2)＝3.31
    3+3 x+x^(2)＝3.31
    75/x-75/(1.25x)=30/60
    1.8*10^8=1.0*14.3*250x(460-x/2)
    (37+x)/(9+x)=3
    46/X=6/40
    40

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