（e-1）x+1＝ex
    5X=25*4-15X
    180*10^3=360*x-360*508-14.3*300*169.33
    180*10^3*2260=14.3*300x*(560-0.5*x)+360*508*(560-40)
    t²+59t-2400=0
    496=（（0.021*x^1.85+326）^0.5）*x^0.84
    x^4/600+21x^3/300+19x^2/30-7x/3-10=0
    x^3/20+0.6x^2+x-10=0
    1.8=1.6*2/10+2.5*3/10+X*5/10
    (26.127+x)×1.85＝52.254+69.431-x
    0.135/x＝0.1289/0.86289
    0.4/100.58＝x/33.95
    0.4/100.58＝x/33.95
    0.4/100.58＝x/33.95
    2000*0.2=x*0.4
    1000*0.2=x*0.4
    6*x^2-4*x+4*63-1=0
    3*x^2-2*x+4*63-1=0
    3*x3-2*x+4*63-1=0
    m^2+2m+3

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