6400/x+x+0.5*x=200
    101.325*x^2/［（1-x）*（10+x）*100］=2.009
    7x+4
    3x²+2x+8=92
    x^2-5x+6=0
    12.02×c=（3.3+c）×7.97
    12.08×c=（3.4+c）×7.97
    abs(90-x)=abs(x-90) abs(90-7)=abs(x-90)
    abs(90-x)=abs(x-90)
    (50+x):(50-x)=5x
    (50+x):(50-x)=x
    (50+x):(50-x)=!(5)
    (50+x):(50-x)=0.|3:0.25
    (50+x):(50-x)=(1/3):(1/4)
    x^2=4 x^2=5 x^2=6 x^2=7
    sin x=-0.279
    sinx =34.57
    x+x+x+x+180481=1028 7891*x=18
    0.|3+0.|5+x=1
    10x+6*(800-x)=6000

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