22x+30（1/2x+15）=6000
    n(100-4n)=400
    n(n-1)=182
    n(n-1)=55
    X/3+X/5=2
    (X/3)+(X/5)=2
    X/3+X/5=2
     x^1997 = x^1995
    50*sin(x)/sin(36)=20/sin(x+36)
    (x-40)(740-10x)=2640
    6xx-65x+50=0
    6x-65x+50=0
    (x-40)(740-10x)=2640
    4x^3+3x-2=0
    2x-8+（2-3x）=0
    2x-8+（-2+3x）=0
    2x-8+（-2+3x）=0
    100= (1+x) + (1+x)^2 + (1+x)^3 + (1+x)^4 + (1+x)^5
    x/20+x/30+x/42＝3
    cos（cosx）=cosx

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