X－0.2X＝1500
    5*x^2+3=4*x^2+4*x
    114514+X=1919810
    （x-2）*(x+2)=2*x-4
    cos x=0.8674
    1/14+2/7+x=3/7
    44.885=（（0.021*x^1.85+159）^0.5）*x^0.84
    X+4/5+1/3=3/4
    100000000*x*(1+x)^20/((1+x)^20-1)=7040000
    175/16=15/4x
    10x=1+x
    19x-8=18
    16=16x^2+x^2
    (2407+x)/(14162+6x)=1/6
    7x*⅓=（4x-1）*⅙+1
    n^2+n=420
    n^2+n=1000
    4k+(k^2-2)*2+2k+4=0
    x^2-x-6=0
    3*(2x+1)-5*(x^2+x)=-1

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