x^1.5-x^2.5/150=42.46
    x^1.5=4530/(106.7-106.7x/30)
    (0.1*a+1)*e^(0.1*a)=2
    x-（0.57X+12000+12000+4000）=0
    2x^2+6=7x
    2x^2-5x+3=0
    x^2-5x-6=0
    x^2-2x+1=0
    x^3+3x^2+3x
    20x^2-100x+21=0
    0.5x+2x＝x
    0.5x+2x＝
    9/2+1.5x＝9
     (7-x)/2+x+x+1 = 9
    84x101
    (7-x)/2+x+x+1＝9
    lnx＝0.0125
    x^4×(1+0.01x^2)=100×(1+0.25x^2)
    2x^3+3x^2+x+100=0
    x^3+3*x^2+5*x+5=0

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