28X-6=4+5X
    (3y-7)/4-1＝(5y-1)/6
    (x*13%-0.09)*12%=1
    x^x^x^x=2
    0.1451sin(x)+0.21362*cos(x)+5.6545*cos(x)*sin(x/2)-0.071207 = 0
    sin2x-sqrt（3）cos2x
    sin2x-sqrt（3）cos2x
    sin2x-sqrtcos2x
    24＾2+24+25x＝0
    24x＾2+24+25x
    （x/2 +1）²
    （x/2 +1）²
    （x/2+1）²
    x+1/x-3
    116/1.33=17*x/6000-x*x/600000
    20+X/30+45/x=1
    e^24x－1＝300x
    e^12×27.3－e^27.3＝27.3x
    50x^25+50x^24+50x^23+50x^22+50x^21 =917.233
    e^24x－e^x＝300x

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