x*3.05+3*2.3=(x+3)*3.04
    x-x*0.88＝165
    x+x*0.13=5000000
    2x+1.1x=22500
    2X+X÷2+x÷4=100-1
    0.45*x-x^2=0.035
    24/x-24/(x+2）=2
    60%X+12×45%=7.8
     24400（1.5*1.732*x^2+300x+5000*1.732）-(24400x+10000*1.732)（3*1.732x+300） = 0
    (lgx+3.665)^2+13=39
    (lgx+3.665)^2+42=39
    lgx=65
    7x=9
    24400（1.5*1.732*x^2+300x+5000*1.732）-(24400x+10000*1.732)（3*1.732x+300）=0
    lgx=37
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.518744)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.627792)
    0.104X^3-2.016X^2+12.1974X=22.638
    eX=25/30
    25=30eX

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