200（x-3）=150(x+3)
    4*x*x+2*x+1=28
    arcsin((a-1)/(a+1))=50
    x^（2）-3=(x-1)^(4)
    0.25x^6+1.25x^4+x^2=100
    16(x-3)^(2)-25=0
    x^(2)=1
    6/X=9/10
    X/6=10/9
    x*x*x-x*x+x=105
    （11+x）:（17+x）=3:4
    6y^2-7y+2=0
    x∧3-x∧2+x=105
    5^2+(x/3)^2=x^2
    5^2+(x/3)%2=x^2
    7/4X-7-5/3X-6=1
    （x＋10）×300 = （x+5）×350
    3x^(3)－x ^(2)-4
    X/(1000000+X)=44.7%
    2/2+x-3=x/3-2/6x+3

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